28. When/ you/ start/ hobby?

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29. so far/ we/ ask/ people/ donate/ books and clothes/ the poor children.

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30. I/ think/ future/ people/ take up/ more/ outdoor activities.

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31. My best friend/ not/ like/ mountain climbing/ because/ he/ afraid/ heights.

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1. Nam enjoys (watch) ……………… TV.

2. She (not/ see) ………………. the plays very often.

3. You ought (study) ……………….. hard.

4. Mai (not/  skip) …………………… in the school yard at the moment.

5. Look! The dog (swim) …………………… in the river.

6. How often  she (read ) …………………….. books.

7. What about (study) ………………………….English?

8. We (call) …………………………… you tomorrow.