diff --git a/01_helloWorld/helloWorld.js b/01_helloWorld/helloWorld.js
index df27036..1a32052 100644
--- a/01_helloWorld/helloWorld.js
+++ b/01_helloWorld/helloWorld.js
@@ -1,5 +1,5 @@
 const helloWorld = function() {
-  return ''
+  return 'Hello, World!';
 };
 
 module.exports = helloWorld;
diff --git a/02_repeatString/repeatString.js b/02_repeatString/repeatString.js
index 4359bbe..f0aa7b1 100644
--- a/02_repeatString/repeatString.js
+++ b/02_repeatString/repeatString.js
@@ -1,5 +1,13 @@
-const repeatString = function() {
-
+const repeatString = function(str, repeatTimes) { 
+    if (repeatTimes < 0)
+        return 'ERROR';
+        
+    let result = '';
+    for (let i = 0; i < repeatTimes; i++)
+    {
+        result += str;
+    }
+    return result;
 };
 
 // Do not edit below this line
diff --git a/02_repeatString/repeatString.spec.js b/02_repeatString/repeatString.spec.js
index 1bcee3c..8379136 100644
--- a/02_repeatString/repeatString.spec.js
+++ b/02_repeatString/repeatString.spec.js
@@ -4,19 +4,19 @@ describe('repeatString', () => {
   test('repeats the string', () => {
     expect(repeatString('hey', 3)).toEqual('heyheyhey');
   });
-  test.skip('repeats the string many times', () => {
+  test('repeats the string many times', () => {
     expect(repeatString('hey', 10)).toEqual('heyheyheyheyheyheyheyheyheyhey');
   });
-  test.skip('repeats the string 1 times', () => {
+  test('repeats the string 1 times', () => {
     expect(repeatString('hey', 1)).toEqual('hey');
   });
-  test.skip('repeats the string 0 times', () => {
+  test('repeats the string 0 times', () => {
     expect(repeatString('hey', 0)).toEqual('');
   });
-  test.skip('returns ERROR with negative numbers', () => {
+  test('returns ERROR with negative numbers', () => {
     expect(repeatString('hey', -1)).toEqual('ERROR');
   });
-  test.skip('repeats the string a random amount of times', function () {
+  test('repeats the string a random amount of times', function () {
     /*The number is generated by using Math.random to get a value from between
     0 to 1, when this is multiplied by 1000 and rounded down with Math.floor it 
     equals a number between 0 to 999 (this number will change everytime you run
@@ -31,7 +31,7 @@ describe('repeatString', () => {
     was randomaly generated. */
     expect(repeatString('hey', number).match(/((hey))/g).length).toEqual(number);
   });
-  test.skip('works with blank strings', () => {
+  test('works with blank strings', () => {
     expect(repeatString('', 10)).toEqual('');
   });
 });
diff --git a/03_reverseString/reverseString.js b/03_reverseString/reverseString.js
index b6d0a9a..863df4f 100644
--- a/03_reverseString/reverseString.js
+++ b/03_reverseString/reverseString.js
@@ -1,5 +1,10 @@
 const reverseString = function(str) {
-
+    if (str.length < 2)
+        return str;
+        
+    const arr = str.split("");
+    const reverse_arr = arr.reverse();
+    return reverse_arr.join("");
 };
 
 // Do not edit below this line
diff --git a/03_reverseString/reverseString.spec.js b/03_reverseString/reverseString.spec.js
index 8adb887..b51c50e 100644
--- a/03_reverseString/reverseString.spec.js
+++ b/03_reverseString/reverseString.spec.js
@@ -5,14 +5,14 @@ describe('reverseString', () => {
     expect(reverseString('hello')).toEqual('olleh');
   });
 
-  test.skip('reverses multiple words', () => {
+  test('reverses multiple words', () => {
     expect(reverseString('hello there')).toEqual('ereht olleh')
   })
 
-  test.skip('works with numbers and punctuation', () => {
+  test('works with numbers and punctuation', () => {
     expect(reverseString('123! abc!')).toEqual('!cba !321')
   })
-  test.skip('works with blank strings', () => {
+  test('works with blank strings', () => {
     expect(reverseString('')).toEqual('')
   })
 });
diff --git a/04_removeFromArray/removeFromArray.js b/04_removeFromArray/removeFromArray.js
index 1bedeb0..a5fc70d 100644
--- a/04_removeFromArray/removeFromArray.js
+++ b/04_removeFromArray/removeFromArray.js
@@ -1,5 +1,12 @@
-const removeFromArray = function() {
-
+const removeFromArray = function(arr, ...restArg) {
+    for (let i = 0; i < restArg.length; i++)
+    {
+        const index = arr.indexOf(restArg[i]);
+        if (index > -1) {
+            arr.splice(index, 1);
+        }
+    }
+    return arr;
 };
 
 // Do not edit below this line
diff --git a/04_removeFromArray/removeFromArray.spec.js b/04_removeFromArray/removeFromArray.spec.js
index 21f34cf..c17239a 100644
--- a/04_removeFromArray/removeFromArray.spec.js
+++ b/04_removeFromArray/removeFromArray.spec.js
@@ -4,22 +4,22 @@ describe('removeFromArray', () => {
   test('removes a single value', () => {
     expect(removeFromArray([1, 2, 3, 4], 3)).toEqual([1, 2, 4]);
   });
-  test.skip('removes multiple values', () => {
+  test('removes multiple values', () => {
     expect(removeFromArray([1, 2, 3, 4], 3, 2)).toEqual([1, 4]);
   });
-  test.skip('ignores non present values', () => {
+  test('ignores non present values', () => {
     expect(removeFromArray([1, 2, 3, 4], 7, "tacos")).toEqual([1, 2, 3, 4]);
   });
-  test.skip('ignores non present values, but still works', () => {
+  test('ignores non present values, but still works', () => {
     expect(removeFromArray([1, 2, 3, 4], 7, 2)).toEqual([1, 3, 4]);
   });
-  test.skip('can remove all values', () => {
+  test('can remove all values', () => {
     expect(removeFromArray([1, 2, 3, 4], 1, 2, 3, 4)).toEqual([]);
   });
-  test.skip('works with strings', () => {
+  test('works with strings', () => {
     expect(removeFromArray(["hey", 2, 3, "ho"], "hey", 3)).toEqual([2, "ho"]);
   });
-  test.skip('only removes same type', () => {
+  test('only removes same type', () => {
     expect(removeFromArray([1, 2, 3], "1", 3)).toEqual([1, 2]);
   });
 });
diff --git a/05_sumAll/sumAll.js b/05_sumAll/sumAll.js
index 00880c7..395a6c2 100644
--- a/05_sumAll/sumAll.js
+++ b/05_sumAll/sumAll.js
@@ -1,5 +1,14 @@
-const sumAll = function() {
+const sumAll = function(st,end) {
+    if (typeof(st)!== 'number' || typeof(end) !== 'number' || st < 0 || end < 0) 
+        return 'ERROR';
 
+    let sum = 0;
+    for (let i = Math.min(st,end); i <= Math.max(st,end); i++)
+    {
+        sum += i;
+    }
+
+    return sum;
 };
 
 // Do not edit below this line
diff --git a/05_sumAll/sumAll.spec.js b/05_sumAll/sumAll.spec.js
index 1a9fb7c..a171e5f 100644
--- a/05_sumAll/sumAll.spec.js
+++ b/05_sumAll/sumAll.spec.js
@@ -4,19 +4,19 @@ describe('sumAll', () => {
   test('sums numbers within the range', () => {
     expect(sumAll(1, 4)).toEqual(10);
   });
-  test.skip('works with large numbers', () => {
+  test('works with large numbers', () => {
     expect(sumAll(1, 4000)).toEqual(8002000);
   });
-  test.skip('works with larger number first', () => {
+  test('works with larger number first', () => {
     expect(sumAll(123, 1)).toEqual(7626);
   });
-  test.skip('returns ERROR with negative numbers', () => {
+  test('returns ERROR with negative numbers', () => {
     expect(sumAll(-10, 4)).toEqual('ERROR');
   });
-  test.skip('returns ERROR with non-number parameters', () => {
+  test('returns ERROR with non-number parameters', () => {
     expect(sumAll(10, "90")).toEqual('ERROR');
   });
-  test.skip('returns ERROR with non-number parameters', () => {
+  test('returns ERROR with non-number parameters', () => {
     expect(sumAll(10, [90, 1])).toEqual('ERROR');
   });
 });
diff --git a/06_leapYears/leapYears.js b/06_leapYears/leapYears.js
index 681eeef..da53dd1 100644
--- a/06_leapYears/leapYears.js
+++ b/06_leapYears/leapYears.js
@@ -1,5 +1,13 @@
-const leapYears = function() {
-
+const leapYears = function(year) {
+    if (typeof(year) !== 'number')
+        return 'ERROR';
+    
+    if((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
+    {
+        return true;
+    }
+    else
+        return false;
 };
 
 // Do not edit below this line
diff --git a/06_leapYears/leapYears.spec.js b/06_leapYears/leapYears.spec.js
index 6fdaba9..2cd4110 100644
--- a/06_leapYears/leapYears.spec.js
+++ b/06_leapYears/leapYears.spec.js
@@ -4,19 +4,19 @@ describe('leapYears', () => {
   test('works with non century years', () => {
     expect(leapYears(1996)).toBe(true);
   });
-  test.skip('works with non century years', () => {
+  test('works with non century years', () => {
     expect(leapYears(1997)).toBe(false);
   });
-  test.skip('works with ridiculously futuristic non century years', () => {
+  test('works with ridiculously futuristic non century years', () => {
     expect(leapYears(34992)).toBe(true);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(1900)).toBe(false);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(1600)).toBe(true);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(700)).toBe(false);
   });
 });
diff --git a/07_tempConversion/tempConversion.js b/07_tempConversion/tempConversion.js
index 6ef3e85..6e74a3d 100644
--- a/07_tempConversion/tempConversion.js
+++ b/07_tempConversion/tempConversion.js
@@ -1,9 +1,15 @@
-const ftoc = function() {
-
+const ftoc = function(temp) {
+  if (typeof(temp) !== 'number')
+    return 'ERROR';
+  
+  return Math.round( (temp-32) * 50 / 9  + Number.EPSILON) / 10;
 };
 
-const ctof = function() {
+const ctof = function(temp) {
+  if (typeof(temp) !== 'number')
+    return 'ERROR';
 
+  return Math.round((temp*9/5 + 32)*10 + Number.EPSILON) / 10;  
 };
 
 // Do not edit below this line
diff --git a/07_tempConversion/tempConversion.spec.js b/07_tempConversion/tempConversion.spec.js
index 93679cc..b1b82f2 100644
--- a/07_tempConversion/tempConversion.spec.js
+++ b/07_tempConversion/tempConversion.spec.js
@@ -4,22 +4,22 @@ describe('ftoc', () => {
   test('works', () => {
     expect(ftoc(32)).toEqual(0);
   });
-  test.skip('rounds to 1 decimal', () => {
+  test('rounds to 1 decimal', () => {
     expect(ftoc(100)).toEqual(37.8);
   });
-  test.skip('works with negatives', () => {
+  test('works with negatives', () => {
     expect(ftoc(-100)).toEqual(-73.3);
   });
 });
 
 describe('ctof', () => {
-  test.skip('works', () => {
+  test('works', () => {
     expect(ctof(0)).toEqual(32);
   });
-  test.skip('rounds to 1 decimal', () => {
+  test('rounds to 1 decimal', () => {
     expect(ctof(73.2)).toEqual(163.8);
   });
-  test.skip('works with negatives', () => {
+  test('works with negatives', () => {
     expect(ctof(-10)).toEqual(14);
   });
 });
diff --git a/package.json b/package.json
index 3c203fe..a8c9e4d 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   "eslintConfig": {
     "root": true
   },
-   "jest": {
+  "jest": {
     "testPathIgnorePatterns": [
       "generator-exercise/"
     ]