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1/ If / he / want / get / good grades / he / must / study / hard /.
…If he wants to get good grades, he must study hard.………
1/ we / lucky / catch / last bus / last night.
………We were lucky to catch the last bus last night.……………
2/ I / not see / her / since / 2003.
…… I haven't seen her since 2003.………………………
4/ My father / like / watch / sports / in the evening.
…My father likes watching sports in the evening.…………
18.If you want to get good grades _____________you studies hard
A. must B.ought C.had to D. has to
19. Let's wait____________ it stop rainning
A.until B.For C.to D. since
20.Columbus discovered America ______________ the 15th century
A.in B.since C. for D. on
21.The course begins__________8am _________5pm
A.from/during B.from/since C.from/to D.in/to
22. Bill asked where ___________from
A.do I come B.did I come C.I come D.I came
without the atmosphere, they will die
=> if there is no atmospherem, they will die.
without the atmosphere, they will die
=> if it isn't for the atmosphere, they will die
1. We can't live without water.
=> If there weren't water , we would die.
If they don't prepare well, they won't get high grades.