用所给单词的适当形式填空。

1. Look, it's ____________ (cloud) now. I think it's going to rain soon.

2. Song Zuying is a ____________ (sing).

3. Are there any interesting ____________ (activity) this evening?

4. He ____________ (not live) in Paris.

5. I like dogs because they are ____________ (friend) to people.

硫脲类药物治疗甲亢的机制是（）

A.抑制甲状腺球蛋白水解酶

B.抑制过氧化物酶

C.拮抗TSH

D.抑制5-脱碘酶

E.抑制脱碘酶