选择所给词的正确形式填空。
1. They _______ (not, water) the flowers now.
2. Look! Tom and John _______ (swim).
3. I have a son. ______name is John. ______is a clever boy (he).
4. —Do you _______ (walk) to school?
—Yes, I do.
5. My mother is cooking some nice food now. ______is a good cook (her).
6. The boys are playing in the bedroom. ______are very happy (them).
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