用所给单词的适当形式填空.

1. Look, the students _______ (speak) English under the tree over there.

2. It's kind of hot because it's _______ (sun) .

3. Are they _______ (swim) in the river? Yes, they are.

4. What's the weather like today? It's _______ (snow) .

5. These people are taking _______ (photo) in the park.

6. There are a lot of clouds in the sky. It's _______ (cloud) .

7. Everyone _______ (be) having a good time.

8. My baby is ten _______ (month) old.

9. Don't _______ (be) shy. I will help you.

10. Can you _______ (give) me some milk?

加热：蒸馏（）

A．播种：收获

B．社会：和谐

C．废气：污染

D．清洁：清理