Choose the best answer to complete the sentences.
1.If there________ no gravity, you do not weigh anything (be/is/were/was)
2.If you________ a report, you'll have to prepare it carefully.(do/did/will do/would do)
3.If Hoa_________ home, she'll tell her parents about her result.(call/ calls/calling/will call)
4.If the local authorities ___________ littering, the environment will become bad. (don't prevent/not prevent/will not prevent/ didn't prevent)
5.If I___________ an astronaut, I would observe the Earth from the moon. (be/is/were/was)
6.I__________ to Lan's birthday party if she invites me. (go/will go/ went/gone)
7.If solar energy is used widely in the future, the environment ____________ .(will be protected/ will be protect/would be protected/would be protect)
8.If the teacher_________ us some homework, we have to stay home and do it. (gives/give/ will give/gave)
9.Their parents would be happy if they ________ the final exam. (passed/pass/will passed/would pass)
10.Please let me know if the teacher___________ .(will come/comes/coming/come)
11. If you______ to pass the exam, you should try harder. (wanted/want/will want/wants)
12.If I had time, I __________ the poor children with studying. (helped/help/will help/would help)
13.If I saw a UFO, I _____________ surprised. (not be/would not be/were not/ won't be)
14. If people destroy the rainforest, rare animals ____________. (would be killed/will kill/ will be killed/ would kill)
15.They will pass the final exam if they _________ hard. (will study/ studied/study/would study)
1. is
2 do
3. calls
4.don't prevent
5.was
6. will go
7. will be protected
8.gives
9. passed
10.comes
11. want
12. would help
13.would not be
14.wil be killed
15. study
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