I'm sorry you ________ so long, but it' 11 still be some time before Jim gets back．

A．wait

B．waited

C．had waited

D．have been waiting

In college, you will discover ________ learning is about, from teacher-taught to self-learner．

A．which

B．that

C．what

D．where

Since the end of the war, many of the priceless antiques ________ to their rightful owners．

A．have returned

B．had returned

C．had been returned

D．have been returned

Jane was elected chairman of the committee．This is the first time that a woman ________ to the post．

A．has appointed

B．had appointed

C．has been appointed

D．had been appointed

He is quite strange, for everything he does is opposite to ________ is considered normal behavior．

A．whether

B．that

C．what

D．which

We must read between the lines, and sometimes ________ the lines, to fully understand the writer．

A．within

B．among

C．besides

D．beyond

There are many examples throughout the world ________ talented players are ignored by their national managers．

A．when

B．where

C．which

D．whose

The seats ________ for children and seniors are right at the front of the buses．

A．reserved

B．reserving

C．to reserve

D．having reserved

________ valuable experience, he asked to be sent to remote areas．

A．To gain

B．Gaining

C．Gained

D．Being gained

The heavy snow lasted for a week, ________ a serious traffic confusion in the whole area．

A．causing

B．caused

C．having caused

D．being caused