5. You should have a plumber ……………. the pipes in your house . (check)
5. If it ………………tomorrow night, we’ll have a party outside. (not rain)
6. Many houses …………….by the tornado last night. (damage)
7. We can protect the environment by ...........................air pollution (reduce)
8. Solar energy can …….……..........on cloudy days. (use)
9. There have been recent .........................….in steel- making technology. (innovate)
10. Solar panels .............................on the roof of a house to receive the energy from the sun . (install)
11. We must stop the ............................of our beaches . (pollute)
12. We can’t swim in this river because it’s highly ...........................(pollute)
13. I suggest ..............................banana leaves ............................food. (use / wrap)
14. All this proves that the system works ..................................(effect).

1. Please,.... the account checked by the accountant first thing tomorrow morning                        a. you have           b. have             c. will have

2. We postponed.........because we didn't have enough money                                                      a. having painted our house     b. have painted our house      c. having our house painted

3. The teacher..............the board                                                                                                   a. had John clean            b. had John cleaned            c. had John to clean

IV. Use the right form of words/ verbs:
1. In the future many buildings will be ………….by solar energy. (hot)
2. Consumers always want cheap, good …………………..(produce)
3. ……………..water can cause many diseases. (pollute)
5. You should have a plumber ……………. the pipes in your house . (check)
5. If it ………………tomorrow night, we’ll have a party outside. (not rain)
6. Many houses …………….by the tornado last night. (damage)
7. We can protect the environment by ...........................air pollution (reduce)
8. Solar energy can …….……..........on cloudy days. (use)
9. There have been recent .........................….in steel- making technology. (innovate)
10. Solar panels .............................on the roof of a house to receive the energy from the sun . (install)
11. We must stop the ............................of our beaches . (pollute)
12. We can’t swim in this river because it’s highly ...........................(pollute)
13. I suggest ..............................banana leaves ............................food. (use / wrap)
14. All this proves that the system works ..................................(effect).