－Smith has hurt his leg．

－Really?________?

Who did that

How did that happen

What's wrong with him

Why was he so careless

－I don't suppose the police know who did it．

－Well, surprisingly they do．A man has been arrested and ________ now．

has been questioned

is being questioned

is questioning

has questioned

－The dustbins ________ for three weeks．

－In fact, they ________ once a week．

haven't emptied; should have been emptied

haven't been emptied; should be emptied

haven't been emptied; should have emptied

haven't emptied; should have emptied

－Has your former classmate come back from America?

－Yes, het ________ here for eight years．

has stayed

is staying

stayed

had stayed

－How did you sleep last night?

－Like a dog．Never slept ________．

well

worse

best

better

－Have you known each other for long?

－Not very long, ________ we started to work in the company．

otherwise

before

when

since

－How much shall I pay for the phone call?

－You ________．This is free of charge．

shouldn't

can't

needn't

mustn't

－Would you help me with my computer?It is broken．

－Certainly, I ________．

would

should

will

can

－What does the sign over there read?

－No person ________ smoke or carry a lighted cigarette, cigar or pipe in this area．

will

may

shall

must

－May I smoke here?

－If you ________, choose a seat in the smoking section．

should

could

may

must