题目内容

根据句意,用所给单词的适当形式填空。
1. Look, there is a bird _____ (sing) in the tree.
2. The bad air makes my chest hurt and it's difficult for me _____ (breath).
3. They are doing their homework carefully. You'd better not _____ (disturb) them.
4. Litter _____ (influence) the look of our city.
5. It is known that smoking does great _____ (harm) to us.
1. singing   2. to breathe   3. disturb   4. influences   5. harm
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