Scientists say it may be five or six years ________ it is possible to test this medicine on human patients.

A．since  

B．after

C．before

D．when

It was a pity that the great writer died ________ his works unfinished.

A．for   

B．with

C．from   

D．of

—How do you ________ we go to Beijing for our holidays?

—I think we'd better fly there.  It's much more comfortable.

A．insist

B．want

C．suppose

D．suggest

The news reporters hurried to the airport, only　　 the film stars had left.

A．to tell

B．to be told

C．telling 

D．told

—Go for a picnic this weekend, OK?

—________. I love getting close to nature.

A．I couldn't agree more

B．I'm afraid not

C．I believe not

D．I don't think so.

She has set a new record, that is, the sales of her latest book ________50 million.

A．have reached

B．has reached

C．are reaching

D．had reached

It is ________ world of wonders, ________ world where anything can happen.

A．a; the

B．a; a

C．the; a

D．不填；不填

—Which of the three ways shall I take to the village?

— ______ way as you please.

A．Each

B．Every

C．Any

D．Either

—You were out when I dropped in at your house.

—Oh, I ________ for a friend from England at the airport.

A．was waiting

B．had waited

C．am waiting

D．have waited

Because the shop ______, all the T-shirts are sold at half price.

A. has closed down

B. closed down

C. is closing down

D. had closed down