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Explanation:

1. C

Think of guerilla warfare. Lots of soldiers would hide behind trees

2. A

You would calculate sales tax in order to know how much to charge a transaction.

3.  B

A blow to the head can put you into a coma

4. D

Bad news is never good for anyone. So, people dread it.

5. A

using both sides of a paper allows for it to last longer.

6.B

Restaurants need cooks.

7.A

su-per-mar-ket

8.C

Moving around the room shows you are "frantic."

9.A

Giving someone your time can lead to a good clause.

10.D

Athletes in general stretch in order to not get cramps.

11. C

Cows have milk

12.B

hiking boots are made to endure different terrains. Therefore, they are the sturdiest show on this list.