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1. I wonder who drank all the milk yesterday. It ..................... have been Mary because she was out all day.
A. can't B. must C. could D. needn't

2. Susan ...................... hear the speaker because the crowd was cheering so loudly.
A. might not B. couldn't C. can't D. mustn't

3. Ted's flight from Britain took more than 11 hours. He ...................... be exhausted after such a long flight.
A. had better B. can C. must D. should

4. You ...................... do the job if you didn't speak Japanese fluently.
A. couldn't B. can't C. won't be able to D. needn't

5. When I was young, I ...................... go fishing with my father.
A. was used to B. would C. may D. used to

6. You ...................... take along some cash. The restaurant may not accept credit cards.
A. has to B. had better C. can D. could