题目内容

用所给单词的适当形式填空
1. Trees must __________(prevent) from being cut down.
2. They __________(plant) ten thousand trees by last spring.
3. The sheep __________(tie) to the tree has eaten a lot of grass.
4. I can easily hear combs __________(go) through hair.
5. Great changes __________(take) in our hometown in the last ten years.
1. be prevented   2. had planted   3. tied   4. going   5. have taken
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