Answer sheet of Solve it 18, 19 and 20

Answer sheet solve it 18:

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

Solve it 19:

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

Solve it 20

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