1 . His family was too poor to a_________ to buy him books. (根据首字母单词拼写)

2 . 我们所不能错失的是在学校里查缺补漏的宝贵时间和机会。(afford)
_____________

3 . As a surgeon, I cannot 　　　 any mistakes; it would be dangerous for the patient.

A．appreciate	B．remove
C．offer	D．afford

4 . We can no longer ________ to consider water an almost free resource that we can use as much as we like.

A．permit

B．afford

C．expect

D．offer