－Hello!May I speak to Tom, please?

－Yes, speaking．

－Oh, I ________ your voice at first．

don't recognize

didn't recognize

hadn't recognized

haven't recognized

－Jane walked past me without greeting．

－She ________ you．

can't see

couldn't see

can't have seen

mustn't have seen

－Shall I lock the lab now before I go home?

－________．I'll check it myself later．

Go ahead

No problem

All right

Don't bother

－Can you tell me ________?

－An engineer from Jinan Iron and Steel Plants．

what your friend is

who your friend is

what is your friend

who is your friend

－Professor Wang is said ________ in New York．

－No wonder he knows a lot about America．

to study

to have studied

to be studying

that he is studying

－Are you satisfied with the result of the examination?

－Not at all．________．

That's all right

It's up to you

It couldn't be worse

It depends

－Are you sure you could do it without any help?

－Don't worry．________．

This is not the first time for me．

Where are we going now?

I can take care of you．

You're always ready to help others．

－What a lot of fun it is to play on a frozen sports field!

－Isn't it rather risky, ________?

though

also

either

too

－Does it rain a lot in this area?

－________, it hardly ever rains; the climate is like that of a desert．

What's more

In other words

On the contrary

As a result

－It's wrong for a student to follow ________ his teachers say．

－It's true．I can't agree ________．

no matter what; to much

whatever; much

no matter what; more

whatever; more