1 . Unless _________ to speak, you should remain silent at the conference, or you will be expelled.

A．inviting	B．having been invited
C．to invite	D．invited

2 . ______is widely acknowledged that computers have become a vital part of our society.

A．As

B．It

C．What

D．Which

3 .      Martin Luther King said in his speech made a deep impression_        both the black and the white.

A．That; on

B．That; in

C．What; in

D．What; on

4 . We’ll have to finish the job, ________.

A．whatever long it takes	B．long however it takes
C．it takes whatever long	D．however long it takes

5 . The boy didn’t begin to prepare his lessons until his father came in.（用强调句改写句子）(句型转换)
__________________________________________________________

8 . 它们确实跨越几个世纪走向我们，仿佛时间本身什么都不是。(do/does/did＋谓语动词)
They really____________________ across the centuries as if time itself were nothing.

9 . It remains to be seen __________ the traffic regulations will adapt to the actual situation after they are released.

A．whether

B．which

C．that

D．what

10 . A lot of language learning, ______ has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.

A．as

B．it

C．that

D．this