On Thursday, President Hu Jintao spoke with French President Nicolas Sarkozy over ________ telephone on ________ global economic issues and next month's G20 summit in Cannes．

A．a; the

B．the; the

C．the;/

D．/; the

________ exchange students can learn many useful things, it is possible that some of them may fall behind in their studies．

A．When

B．As

C．Since

D．While

If you don't know the meaning of a word, the best way is to ________ a dictionary．

A．look up

B．consult

C．find

D．refer

This disease is second only ________ heart attack as a cause of death all over the world．

A．to

B．of

C．with

D．from

Your performance in the driving test didn't reach the required standard, ________, you failed．

A．after all

B．in the end

C．in other words

D．at the same time

If Flora hadn't gone back for the letter, I'm sure she ________ have missed the bus．

A．wouldn't

B．mustn't

C．needn't

D．shouldn't

When ________ about his discovery, Fleming said：“One sometimes finds what one is not looking for．”

A．asked

B．to be asked

C．being asked

D．asking

At first I wanted to talk to Uncle Sam．Then I changed my mind, ________ that he could do nothing to help．

A．to realize

B．realized

C．realizing

D．being realized

The pace of life in the city is rapid and busy, unlike in the country ________ it is more relaxed and slow．

A．when

B．where

C．that

D．which

Jane's pale face suggested that she ________ ill, and her parents suggested that she ________ a medical examination．

A．be; have

B．was; have

C．be; had

D．was; has