用所給動詞的適當形式填空，每詞限用一次。

encourage, master, boil, prevent, perform, talk back

1.Nobody ____________ waster water from polluting the river unless something is done.

2.My friend Tom ___________ about 1,000 Chinese words in the past 3 months.

3.Tom regretted ______ to his teacher.

4.--- Where’s your mom, Mary?

--- Sorry, I don’t know. Maybe she _________ some soup in the kitchen.

5.Studying is the most important to teenagers. They shouldn’t ______ to work part-time.

6.The actor __________ a funny comedy and made us all laugh.

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