Answer sheet for solve it 21, 22 and 23

 Solve it 21:

1. D
2. A
3. C
4. A
5. B
6. C
7. C

Solve it 22:

1. D
2. C
3. A
4. B
5. C
6. B
7. D

Solve it 23:

1. A
2. D
3. B
4. C
5. C
6. A
7. D