用所给词的适当形式填空。

1．My little son enjoys English but he has trouble              (pronounce) English words.

2．My life              (change) a lot in the last few years.

3．Don't get your ears              (pierce).

4．When we are angry, however, we are usually the ones              (affect).

5．Don't you remember              (borrow) $100 from me?

6．His mother's love helped him to feel good about              (he).

7．The big fire made his face              (terrify).

8．We need at              (little) two days to finish the work.

9．Children should              (teach) to study hard.

10．If you keep on it, you              (success).

异烟肼的化学名为

A．4-吡啶甲酰肼
B．4-哌啶甲酰肼
C．4-吡啶乙酰肼
D．4-吡咯甲酰肼
E．3-吡啶甲酰肼