用所给单词的适当形式填空。

1. Would you like to _____________ (plant) trees?

2. She can _____________ (swim) in the river.

3. Let me _____________ (have) a look.

4. Mary _____________ (read) a book now.

5. Let's _____________ (invite) your parents to the party.

6. She has twelve _____________ (knife).

7. I like collecting _____________ (leaf).

8. Last year Mr. Black _____________ (study) Chinese.

维生素D缺乏性佝偻病活动期主要临床表现是（）

A.烦躁多哭

B.睡眠不安，夜惊

C.骨骼系统改变

D.突然抽搐

E.多汗