_________ will become more and more important to have a good knowledge of English．

What

Which

That

It

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

how

what

where

who

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

which

what

that

one

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

are working

have been working

worked

had worked

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

couldn't

wouldn't

needn't

mustn't

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

saved

saving

to be saved

having saved

His speech is so confusing that it's difficult to make out _________ he is trying to express．

that

how

who

what

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

emotions

principles

regulations

opinions

In _________ communication, a smile is usually _________ strong sign of friendly attitude．

the; 不填

a; the

不填; a

the; a

I was halfway back to the hospital where the doctor was working _________ Susan caught up with me．

when

while

until

though