III. Put the verbs in brackets into the correct form.

1. If he (study) ________________ harder, he can pass an exam.

2. She may be late if she (not hurry) ________________.

3.If you study harder, you (pass) ________________ the exam.

4.If people really cared about the environment, they ( not dump ) ________________ waste into the lake.

5.If there was no fresh water in the world, what (happen) ________________.

6.If you (be) ________________ the president, what would you do to help the environment ?

7.They get sick so often. If they exercised more, they (be) ________________ healthier.

8.If I (have) ________________ one million US dollars, I would build more parks in our city.

9. Four countries ______________ (visit) by John so far.

10. London ______________ (have) a population of eight million people.

11. Vietnam’s Independence Day ________________ (celebrate) on September 09th.

12. We ______________ (visit) Sydney Opera House for several times.

13. Some activities ______________ (prepare) to celebrate the lunar new year now.

14. When I came to the stadium, the match (start) _____________________

15. Before she (listen) _____________ to music, she (do)_____________ homework.