2.
What happens if you fail to outwit and beat your competition? Give examples below.

You lose and/or fail.

Example: my competition in checkers outwitted me and defeated me, so I didnt win.

Explanation:

When someone beats you, you dont win. The opposite of win is lose, or defeated.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.