1 . Last Monday, I was chatting online ______, before I knew it, our manager came in and stood behind me.

A．until

B．as

C．when

D．while

2 . At that time, people ______that all species had appeared on Earth at the same time, and ______since.

A．was believing; didn’t change	B．believed; hadn’t changed
C．had believed; hadn’t changed	D．believed; haven’t changed

3 . —Do you think it ______ to argue with them?
—The question is not worthy ______.

A．worthwhile; discussing	B．worthwhile; to be discussed
C．worthy; to discuss	D．worth; to be discussed

4 . ______ is known to all is that the old scientist, ______ Chinese people are proud of, is still devoted to advancing the medical development.

A．As; whom

B．What; whose

C．It; whose

D．What; whom

5 . It can be hard for you to imagine what difficulty I have had ______ the problems ______ in the meeting held last week.

A．to deal with; brought up	B．dealing with; bringing up
C．dealing with; brought up	D．to deal with; bringing up

6 . I’ll never forget the days ______ I studied hard in my senior high school, ______ changed my whole life.

A．when; which

B．that; which

C．which; when

D．when; that

7 . He suggested that the problems ______ paid special attention to.

A．referred to being

B．referring to being

C．referred to be

D．referring to be

8 . ______, as a matter of fact, has been put forward at the conference is ______ the government should motivate the graduates to set up their own business.

A．What; that

B．It; what

C．What; what

D．That; that

10 . It can be hard for you to imagine what trouble I have had __________ the problems __________ in the meeting __________ last week

A．to deal with; referring to; held	B．dealing with; referring to; being held
C．dealing with; referred to; held	D．to deal with; referred to; being held