用括號內(nèi)所給動詞的適當(dāng)形式填空。
1. The report shows that some animals can _____ (train) to work for people.
2. Those dried flowers _____ (not sell) as well as the fresh ones.
3. Where is Jim? I'm afraid he _____ (forget) the visit to the museum.
4. The passengers were told that the plane _____ (take) off in two hours because of the bad weather.
5. —It is reported the police searched the whole building yesterday but nothing unusual was found there.
    —Really? I _____ (think) the thief had already been caught.
6. In order to complete the task, all the club members had no choice but _____ (stay) up late.
7. He failed the math exam again because the bell _____ (ring) before he finished the rest half of the
    testing-paper.
8. Many scientists are always trying to devote themselves to _____ (study) in different areas.
1. be trained   2.don't sell   3. has forgotten   4. would take  
5. thought   6. to stay        7. had rung/rang   8. studying
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