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

1.     Carol (miss) _________ her plane yesterday because of a traffic jam on her way to the airport. By the time she (get) _________ to the airport, her plane (already/leave) _________.

2.     We were not hungry. We (just/have) _________ a big breakfast.

3.     Mozart (start) _________ to compose at the age of five and (write) _________ more than 600 pieces of music.

4.     It’s very cold. I (light) _________ a fire.

5.     You must wake her. She (sleep) _________ soundly for 10 hours.

6.     My teacher (teach) _________ English at this school for six years.

7.     It usually (rain) _________ very much in that part of the country.

8.     Look ! That light (burn) _________ all night.

9.     My mother (arrive) _________ while I (clean) _________ the kitchen.

10.      Albert Einstein (die) _________ in 1955.

11.      He fell while he (go) _________ downstairs.

12.      When the students (hear) ________ the bell, they (get) ________ up and (leave) _______.

13.      Professor Kenneth (teach) _________ another class last year.