1) John ___ speak three foreign languages.
can
may
must
has to

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2) You ___ work hard at your English, if you want to know it.
may
should
can
are to

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3) Mary ___ be in this room. It is her voice.
must
have to
should
need

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4) Everyone ___ obey the law.
should
may
must
can

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5) Mary ___ have gone to bed earlier last night. She is very tired today.
should
could
have to
must

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6) You ___ worry about the party any more. I'll take care of it.
don't need to
do need to
needn't to
need to

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7) You ___ see a doctor.
need
should
have
may to

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8) She has passed the exam. She ___ all last night.
can study
may have studied
must have studied
could have studied

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9) The boss said that I ___ be at work at nine o'clock.
had to
ought
can
will be able to

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10) Mary ___ close the window; it is getting cold.
had better to
would better
had better
should to