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.1. stop 2. worry 3. easily 4. knives 5. Don't do 6. is showing 7. crossed