用所给单词的正确形式填空。
1. Let's ____________ (stop) the car.
2. Don't ____________ (worry). I can help you.
3. I can find it ____________ (easy).
4. How many ____________ (knife) do you have? What do the man' s parents want him to be? A．A teacher．B．An engineer．      C．A doctor．
5. ____________ (not do) your home work now.
6. He ____________ (show) me his photo now.
7. The boat ____________ (cross) the river a moment ago.

【考点】祈使句,复数名词,副词,系动词,现在进行时，现在分词,一般过去时，动词过去式

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