用所给单词的适当形式填空。

1. You can go swimming in the _____ (swim) pool.

2. Please help _____ (your) to some fish, children.

3. Neither you nor he _____ (be) going to Beijing.

4. They each _____ (have) a Chinese-English dictionary.

5. Neither _____ (book) is mine.

6. Either of the twins often _____ (ask) questions.

7. _____( no) of my friends is a doctor.

8. —What _____ your father _____ (like)?  

    —He's very friendly.

用于制造凸轮轴、连杆等零件的铸铁材料是()

A.灰口铸铁 

B.球墨铸铁 

C.蠕墨铸铁 

D.可锻铸铁