白喉计划免疫采用（）

A.丙种球蛋白

B.抗毒素

C.类毒素

D.死疫苗

E.活疫苗

根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。

小题1:It is well known to everyone that one fifth is eight           (四十).

小题2:Have you thought of a useful way to solve it after __________ (考虑) the problem for 3 days?

小题3:I don’t like that I’m often ______________ (比较)with my classmates by my mother.

小题4:Is it true that the robot can do ______________(无论什么) it is asked to?