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She ........ be very brave to climb that mountain in the winter.
must
...... to talk about pollution in class tomorrow? (We)
Do we have to
You ...... become successful if you don't try hard.
can't
John ...... worry about his future. He's very talented.
shouldn't
....... I borrow you laptop for a few days?
May/ Could
That ..... possibly be Louis. He's away from the meeting.
can't
