He is eighteen and he is old enough to _____ the army.

1. A.
   take part in
2. B.
   join
3. C.
   join in
4. D.
   attend

He is eighteen and he is old enough to _____ the army.

[　　]

A．take part in　　　B．join

C．join in　　　　　D．attend

He is not old enough, but he ________ sent to join the army．

1. A.
   insisted being
2. B.
   insisted to be
3. C.
   insisted on being
4. D.
   insisted on to be

他年龄太小不能参军。

Which of the following is wrong?

[　　]

A．He is too young to join the Army.

B．He isn't old enough to join the Army.

C．He is very young to join the Army.

D．He is so young that he can't join the Army.