Thousands of trees must _______ every year. [ ]A. plant B. be planted

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Thousands of trees must _______ every year.   [     ]
A. plant
B. be planted
C. have been planted
D. have planted

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举一反三

I won"t come to the party unless you ______, too.  [     ]
A. will invite
B. invites
C. invited
D. are invited

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In those days, books _____ one at a time by hand.    [     ]
A. should be produced
B. should be produce
C. could be produced
D. could produce

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将下列主动语态变成被动语态。
1. We must finish the work in two days.
    The work must _____ in two days.
2. Mrs. Green has given Robert a present for Christmas.
   Robert _____ a present for Christmas.
3. We have used paper and printing for ages.
   Paper and printing _____ for ages.
4. He doesn"t think computers can replace books.
   He doesn"t think books _____ by computers.
5. We have bought some gifts for the poor children.
   Some gifts _____ for the poor children.

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同义句转换.1.It is not possible to clean up the river in two days.
_______ _______ to clean up the river in two days.
2.It is full of hope for the team to win the match.
It _______ _______ for the team to win the match.
3.You know these papers can be used again.
You know these papers can _______ _______.
4.We all hope that the project will be a success.
We all hope that the project will _______ _______.
5.Drinking polluted water is not healthy.
Drinking polluted water _______ _______.

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Thousands of trees should ________ on the mountain.   [     ]
A. be planted
B. plant
C. planting
D. planted

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