用所给词的正确形式填空。

1. His father worked for twenty hours without_____ (stop).

2. Norman Bethune will _____ (miss)  by Chinese people forever.

3. Mother bought enough food_____ (feed) our dog.

4. Einstein's letter asked people_____ (give) up nuclear weapons.

5. Now he is working on _____ (develop) new  machine.

从文学常识角度看，其中不同的一项是（）。

A.《拿来主义》

B.《友邦惊诧论》

C.《论雷锋塔的倒掉》

D.《藤野先生》