3.3 课时作业
Ⅰ.用括号内所给动词的适当形式填空
1．With the help of high technology, more and more new substances ________ (discover) in the past 50 years.
2．The construction of the new bridge ________ (complete) by now.
3．She ________ (laugh) at by her classmates since she was young.
4．Every possible means ________ (try) to save the wild animals up to now.
5．How many suggestions ________ (give) to you so far?
6．The plans ________ (study) by the experts for four times.
7．This is the second time that he ________ (praise) by his teachers this week.
8．Much of its traditional folk culture ________ (keep) alive ever since it was born.
9．A lot ________ (do) in the recovery of national economy in the past few years.
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10．Students are told to make sure that the windows ________ (close) before leaving the classroom.
答案：1.have been discovered 2.has been completed
3．has been laughed 4.has been tried
5．have been given 6.have been studied
7．has been praised 8.has been kept 9．has been done 10.have been closed
Ⅱ.将下列句子改为被动语态
1．They have put the computer into a robot.
________________________________________________________________________
2．We have finished the work now. ________________________________________________________________________
3．He has given the child some interesting books.
________________________________
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________________________________________
4．Have they returned the book yet? ________________________________________________________________________
5．Over time, people have changed me a lot.
________________________________________________________________________
6．A new virus has attacked my computer.
________________________________________________________________________
7．I have made him study hard. ________________________________________________________________________
8．Have you found ways to make waste water clean?
________________________________________________________________________
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答案：
1．The computer has been put into a robot by them.
2．The work has been finished by us now.
3．The child has been given some interesting books by him./Some interesting books have been given to the child by him.
4．Has the book been returned by them yet?
5．Over time, I have been changed a lot by people.
6．My computer has been attacked by a new virus.
7．He has been made to study hard by me.
8．Have ways been found to make waste water clean (by you)?
Ⅲ.完成句子
1．这个贼已经被逮住了。 The thief __________________. 2．这些狗受了虐待。
The dogs __________________ badly.
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