用所给词的适当形式填空。
1. They are busy ________(do)their homework now.
2. Mr.Zhang told us ________(not play)near the lake.
3. ________(be)there any pollution in your city?
4. Could you help me mend the ________(break)bike?
5. Look, they are ________(ski).
6. May is the _________(five)month of a year.
7. I usually play table tennis ________(two)a week.
8. We ________(not should)spend much time on the computer.
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