________ will become more and more important to have a good knowledge of Eng-lish．

A．What

B．Which

C．That

D．It

We got lost in the forest and decided to remain ________ we were and waited for rescue．

A．how

B．what

C．where

D．who

The new computer, ________ he loves a lot, breaks down frequently．

A．which

B．what

C．that

D．one

We ________ on this project for four hours．Let's have a rest．

A．are working

B．have been working

C．worked

D．had worked

You ________ read a book in the sun-it'll do harm to your eyes．

A．couldn't

B．wouldn't

C．needn't

D．mustn't

The rare fish, ________ from the cooking pot, has been returned to the sea．

A．saved

B．saving

C．to be saved

D．having saved

His speech is so confusing that it's difficult to make out ________ he is trying to ex-press．

A．that

B．how

C．who

D．what

It's against my ________ to accept gifts from patients．

A．emotions

B．principles

C．regulations

D．opinions

In ________ communication, a smile is usually ________ strong sign of friendly at-titude．

A．the,不填

B．a, the

C．不填，a

D．the, a

________ is clear that he hasn't told the truth．

A．It

B．That

C．What

D．He