5. Those bridges were built by the workers in 1972.
6. Are more trees going to be planted in that region ?
7. By whom this letter was written ?
8. The floor is cleaned by him twice a week.
9. English songs are being sung beautifully.
10. Can that problem be solved by Nam ?
B.
1. is
2. is played
3. is called
4. aren't allowed
5. is controlled
6. wasn't played
7. was made
8. was enjoyed
9. was banned
10. spent
11. was played
12. is held
