－Alice, do you like traveling?

－Sure．I _________ to Beijing last year, but I _________ anywhere since then．

went; didn’t go

have gone; haven’t gone

went; haven’t gone

went; hadn’t gone

－The window is dirty．

－I know．It _________ for weeks．

hasn’t cleaned

didn’t clean

wasn’t cleaned

hasn’t been cleaned

－Waiter, what about my dish? I _________ for over half an hour．

－Oh, sorry, madam．Just two more minutes, please．

have waited

was waiting

had been waited

have been waiting

－How much is the latest style of the watch?

－Sorry, I have no idea．But it _________ and I’ll know the price soon．

has produced

has been producing

is produced

is being produced

－Where _________ my dictionary? I can’t see it anywhere．

－I _________ it right here, but now it’s gone．

did you put; have put

have you put; put

had you put; have put

were you putting; have put

－I didn’t know you were good friends．

－You _________．I have known her since she moved here．You were studying abroad then．

may have

needn’t have

couldn’t have

must have

－Was that the new comer who walked by?

－_________．

It must be that

It must have been

He must be

This must have been

－Hi, Sam, I'm going to take a long walk along the sunny beach and go swimming today．

－________!

How nice you are

That's all right

Sounds great

Good exercise

－Is Jack on duty today?

－It ________ be him．It's his turn tomorrow．

mustn't

won't

can't

needn't

－Who, ________, is the best basketball player in China?

－I think it's Yao Ming．

do you think

in your opinion

believe it or not

as a result