Multiple Choice. Write the letter of the correct answer on the space provided before each number

Answer:
1.a
2.c
3.b
4.b
5.d
6.a
7.d
8.b
9.c
10.c
11.a
12.b
13.c
14.b
15b
16.c
17.d
18.b
19.c
20.d
21.a