1 . My brother took the pills for only three days before he fully recovered, so the medicine________(prove) effective. (所给词的适当形式填空）

2 . It r________to be seen whether his plan will work. (根据首字母提示单词拼写)

3 . The theory that he had stuck _______ true, which made all of us astonished.

A．to proving	B．proved
C．to proved	D．to prove

4 . Tom, you should know how to behave yourself. After all you will __________ 20 next month, and will __________ a teacher after you graduate from college next year.

A．become; turn	B．turn; become
C．become; become	D．turn; turn

5 . __________ from the people and the world, the boy eventually __________ heavy internet user with some mental problems.

A．Withdrawn, became	B．Withdrawn, turned
C．Withdrawing, became a	D．Withdrawing, turned a