8. Teenagers must be e______ in school.

7. My father w_____ about 70 kg.

6.R______ paper is very easy.

5. They often r____ money and clothes to help the people in trouble.

4. Scientists have d______ many new plants

3. We can’t see the blue in some cities because of the p_____ air.

2. Have you received an e-mail from her r_____?

1. Dongbei Tigers are e_______ animals, we must do something to protect them.

7. 我不知道明天是否下雨. 如果下雨的话, 我会呆在家里.

6. 上海是中国最大的城市之一.