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.
16. Last night, Peter (go)______ to the supermarket before he (go) __________ home.
17. Most students (leave) _____________ before the volcano (erupt) __________.
18. I (find) ____________ my pen after I (buy)_____________________ a new one.
19. Food and medical supplies (deliver)…………………….yesterday afternoon.
20. In the future, natural disasters (predict)… accurately with the help of technology.
21.Three cats (rescue) ………………………….by the volunteers last Sunday.
22. Two houses (build) ………………………….in the city every years.
23. Earth (hold)………………………. by the gravity of the sun and orbits around it
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