下列四个反应中水起的作用与其他不相同的是(　　)

①Cl₂＋H₂O　②Na＋H₂O　③NO₂＋H₂O　④Na₂O₂＋H₂O

A．①

B．②

C．③

D．④

用所给词的适当形式填空。

1. I hear you _____ (go) to Tibet for working next year. Can I go with you?

2. She was _____ (interest) in the places of _____ (interest) in China.

3. It _____ (take) me half an hour _____ (take) the photos last vacation.

4. I planned _____ (take) walks with his lovely dog after supper.

5. On the morning of my birthday. I can't wait _____ (open) the presents.

6.  _____ (sleep) a lot is good for your health.

7. I can't stand _____ (go) camping or _____ (hike) alone. It's too dangerous.

8. I _____ (be) a professional doctor after graduation from college.

9. How often _____ your parents _____ (exercise) on weekends?

10. Hurry up! Your sister _____ (wait) for you to go surfing.