Choose the correct option to fill in the gaps:

Paul……………… be at home; he always works until 9 p.m.
1. can’t
2. mustn’t
3. can
My sister …………… come back from London tonight, but I’m not sure.
1. may
2. ought to
3. must
Carl …………… speak a word of English before travelling to Britain.
1. can’t
2. wasn’t able to
3. wasn’t allowed to
Mary ………… have forgotten our appointment. Why isn’t she here?
1. can
2. must
3. may
…………… I use your phone, please?
1. Must
2. Should
3. May
You ………… have told us about Sue’s divorce. We made such insensitive comments on her husband!
1. shouldn’t
2. should
3. mustn’t
My son has always been a clever boy; he ……… read when he was three.
1. could
2. might
3. may
I’m afraid I ……………… go out tonight, I ……… work late.
1. can’t/ can
2. can’t/ have to
3. can’t/ should
You often have headaches. I think you ………… visit a neurologist.
1. may
2. can
3. should
There are some black clouds in the sky. It …………… rain this evening.
1. must
2. may
3. ought to
The children ………… have finished their homework by the time we get home, but I’m not sure.
1. aren’t able to
2. have to
3. might
Most children ………… wear school uniforms in private schools.
1. might
2. must
3. can
Why didn’t you phone Paul? He ………… have given a lift to the airport yesterday.
1. can
2. ought to
3. could
A. “Isn’t that John over there?”
B. “It ……… be John, he’s at work now.”
1. mustn’t
2. can’t
3. shouldn’t
The new student ……… be German, he doesn’t speak German fluently.
1. shouldn’t
2. mustn’t
3. can’t
Someone’s knocking at the door. It …………… be James; he said he’ come round today.
1. ought to
2. must
3. can’t
You …………… buy a dictionary; there are a lot in class.
1. may not
2. mustn’t
3. needn’t
People ………… fasten seat belts when travelling by car.
1. must
2. can
3. should
Dad is taking a nap; you ………… make so much noise, children.
1. mustn’t
2. might not
3. needn’t
We’ve run out of coffee. We ………… get some tomorrow.
1. may
2. must
3. might
You ………… better go home now, it’s getting dark.
1. would
2. should
3. had
You ……………… have eaten the chocolate cake, children! It was for dad’s party.
1. can’t
2. might not
3. mustn’t
A. “Why is Sue late for work?”
B. “Her train …………… have been delayed due to the strike”.
1. can’t
2. ought to
3. might
You …………… bring anything; we’ve bought everything for dinner.
1. have not to
2. may not
3. don’t need to
Pam …………… have set the alarm clock since she had the day off.
1. mustn’t
2. can’t
3. needn’t
Paul asked me to check the exercises. He thought I …………… have made a mistake.
1. might
2. can
3. should
Mrs Black will get angry. I …………… have written the history essay last weekend.
1. must
2. should
3. may
I ………… take a bus to school; I go there on foot every day.
1. mustn’t
2. needn’t
3. shouldn’t
A. “I like the new TV series!”
B. “Are you kidding? You …………… like it; it’s the worst programme on TV”.
1. needn’t
2. mustn’t
3. can’t
Be careful with the knife! It’s very sharp, you ………… cut your finger.
1. should
2. may
3. need to