diff --git a/csharp-fundamentals-control-flow.Main/Core.cs b/csharp-fundamentals-control-flow.Main/Core.cs
index 9fe1a9d..dc86ec4 100644
--- a/csharp-fundamentals-control-flow.Main/Core.cs
+++ b/csharp-fundamentals-control-flow.Main/Core.cs
@@ -48,61 +48,64 @@ public string sayGoodMorning(bool isMorning)
         // Change the returned value in the method below to your answer. It is case-sensitive.
         public string one()
         {
-            return "";
+            return "Good day!";
         }
 
         //TODO: 2. What will the output be if I run sayGoodMorning(true)?
         // Change the returned value in the method below to your answer. It is case-sensitive.
         public string two()
         {
-            return "";
+            return "Good morning!";
         }
 
         //TODO: 3. What will the output be if I run sayGoodMorning("Hello" == "Hello")?
         // Change the returned value in the method below to your answer. It is case-sensitive.
         public string three()
         {
-            return "";
+            return "Good morning!";
         }
 
         //TODO: 4. What will the output be if I run sayGoodMorning("A word" != "Another word")
         public string four()
         {
-            return "";
+            return "Good morning!";
         }
 
         // 5. What will the output be if I run sayGoodMorning(25 != 25)
         public string five()
         {
-            return "";
+            return "Good day!";
         }
 
         //TODO: 6. Use a conditional statement to return "Correct!" if the input is more than 7
         // or "Wrong!" if not
         public string six(int num)
         {
-            throw new NotImplementedException();
+            if (num > 7) { return "Correct!"; }
+            return "Wrong!";
         }
 
         //TODO: 7. Use a conditional statement to return "Correct!" if the input is false
         // or "Wrong!" if not
         public string seven(bool boolean)
         {
-            throw new NotImplementedException();
+            if (!boolean) { return "Correct!"; }
+            return "Wrong!";
         }
 
         //TODO: 8. Use a conditional statement to return "Correct!" if numOne is more than or equal to numTwo
         // or "Wrong!" if not
         public string eight(int numOne, int numTwo)
         {
-            throw new NotImplementedException();
+            if (numOne >= numTwo) { return "Correct!"; }
+            return "Wrong!";
         }
 
         //TODO: 9. Use a conditional statement to return true if the array provided is not empty
         // or false if it is empty
         public bool nine(int[] nums)
         {
-            throw new NotImplementedException();
+            return nums.Length >= 1;
         }
 
         //TODO: 10. Use a conditional statement to return true if the provided string contains the word
@@ -110,7 +113,7 @@ public bool nine(int[] nums)
         // https://www.w3schools.com/java/java_ref_string.asp
         public bool ten(string sentence)
         {
-            throw new NotImplementedException();
+            return sentence.Contains("milk");
         }
 
         //TODO: 11. Use conditional statements to return the number 3 if the provided string contains
@@ -119,14 +122,17 @@ public bool ten(string sentence)
         // Otherwise, return the number 0.
         public int eleven(string sentence)
         {
-            throw new NotImplementedException();
+            if (sentence.Contains("milk") && sentence.Contains("coffee")) { return 9; }
+            else if (sentence.Contains("coffee")) { return 6; }
+            else if (sentence.Contains("milk")) { return 3; }
+            return 0;
         }
 
         //TODO: 12. Use conditional statements to return true if num is more than or equal to lower and is
         // less than or equal to upper, otherwise return false.
         public bool twelve(int num, int lower, int upper)
         {
-            throw new NotImplementedException();
+            return num <= upper && num >= lower;
         }
 
         /*
@@ -141,7 +147,11 @@ public bool twelve(int num, int lower, int upper)
          */
         public string thirteen(int age)
         {
-            throw new NotImplementedException();
+            if (age <= 0){ return "Baby"; }
+            else if (age < 5){ return "Toddler"; }
+            else if (age < 13){ return "Child"; }
+            else if (age < 20){ return "Teenager"; }
+            else { return "Adult"; }
         }
     }
 }