词形变换。

1. The ________ Sunday in May is Mother's Day. (two)

2. The teacher told us not to go ________ alone in the river. (swim)

3. I want to be an ________ when I grow up. (invent)

4. Shouting in public is ________. (polite)

5. We are ________ about the good news. (excite)

6. The ________ we exercise, the healthier we'll get. (much)

7. It is ________ that many drinks are bad for our health. (say)

8. As a student, we should listen to teachers ________. (careful)

9. It is very cold outside. You had better ________ on a coat. (put)

10. He told me he ________ go to the Great Wall tomorrow. (will)