I don't really work here；I _______ until the new secretary arrives.

A. just help out  B. have just helped out                 C. am just helping out      D. will just help out

The weather turned out to be very good, _______ was more than we could expect.

A. what 　　　        B. which 　　　   C. that 　　　              D. it

No one knows exactly ______ this important discovery was made.

A. that　　　        B. that how 　　    C. what 　　            D. when

He plays well or badly according to his mood (????), so he's a very _________ player.

A. modest         B. easygoing     C. temperamental             D. calm

Here are two pairs of shoes, ______ you may choose.

A. both of them         B. either of them   C. any of which 　　　    D. either of which

It’s the first time ______ he has helped us. 

A. that                 B. before        C. when                  D. who

If something ________, it becomes less and less and eventually disappears completely.

A. dies off                B. breaks off       C. dies out                 D. breaks out

I would appreciate          back this afternoon.

A. you to call          B. you call     C. your calling              D. you’re calling

_______ is known to all, Lu Xun was famous as a great thinker.

A. Which            B. As           C. It                    D. What

Use your head, _______ you’ll work out the problem.

 A. so                  B. or            C. for                   D. and