35．Failure is never pleasurable, but it can make a positive contribution to your life _________ you learn to use it.

A．since　　　　　　　　　　 B．once　　　　　　　　　　 C．until　　　　　　　　　　 D．unless

34．-Mike is often absent from class.

-Tell him he ________ answer for it if he goes on behaving like that.

A．shall　　　　　　　　　　 B．will　　　　　　　　　　　 C．would　　　　　　　　　 D．must

33．_______ the Internet is of great help, I don’t think it’s a good idea to spend too much time onit.

A．If　　　　　　　　　　　　 B．While　　　　　　　　　　 C．Because　　　　　　　　 D．As

32．I would have come earlier, but I _________ that you were waiting.

A．didn’t know　　　　　 B．hadn’t known　　　　 C．wouldn’t know　　　 D．haven’t known