Fixed grammar

Projects/Battleship-Bot.md

@@ -2,7 +2,7 @@
 
 **Tier:** 3-Advanced
 
-Battleship Bot is takes the [Battleship Game Engine](./Battleship-Game-Engine.md)
+Battleship Bot takes the [Battleship Game Engine](./Battleship-Game-Engine.md)
 to the next level. This challenge uses your Battleship Game Engine to create a
 presentation layer using Discord's bot API to allow you to play the game
 via a Discord chat.

Projects/Bin2Dec-App.md

@@ -13,7 +13,7 @@ and 1's, in any sequence and then displays its decimal equivalent.
 This challenge requires that the developer implementing it follow these
 constraints:
 
--   Arrays may not be used contain the binary digits entered by the user
+-   Arrays may not be used to contain the binary digits entered by the user
 -   Determining the decimal equivalent of a particular binary digit in the
     sequence must be calculated using a single mathematical function, for
     example the natural logarithm. It's up to you to figure out which function

Projects/Bit-Masks-App.md

@@ -38,7 +38,7 @@ and their timezones:
     - Beijing: GMT +8
     - Ho Chi Mihn City: GMT +7
     - Mumbai: GMT +5
--   [ ] User can see a GMT search box that an integer representing a GMT offset
+-   [ ] User can see a GMT search box where an integer representing a GMT offset
 can be entered into and a 'Find Cities' button.
 -   [ ] User can click the 'Find Cities' button to display the names of the
 cities in that GMT offset in an output area.

Projects/Flip-Art-App.md

@@ -3,7 +3,7 @@
 **Tier:** 2-Intermediate
 
 Many developers have found that adding animation to an application is a
-useful technique add impact to the UI, to make it  more appealing to its users,
+useful technique that adds impact to the UI, to make it more appealing to its users,
 and to explain complex subject matter. But, as a developer how do you create 
 these and how do you know what images make effective animations?