四、用所给词的适当形式填空。
1. My brother often (climb) the mountain with my father on the weekend.
2. Su Xin is (write) to her friends.
3. Look at the (cloud) in the sky. Let's go home.
4. Please (stop). The light is red.
5. My grandpa often (do) exercise in the morning.
6. — What are you doing?
— We are (listen) to the music.
7. — Mom, where are you?
— I'm in the kitchen, dear. I'm (cook) for you.
8. — What can you do, Susan?
— I can (help) other people.
9. — Is it (rain), Dad?
— Yes, it is. Take your raincoat, please.
10. — What are you going to do, Dan?
— I'm going to buy some (candle).

1. climbs 2. writing 3. clouds
4. stop 5. does 6. listening 7. cooking
8. help 9. raining / rainy 10. candles