—Whose English book is this?
—It _______ be Lily’s, but I’m not sure.
might
can’t
must
Don’t touch the machine_________ the teacher allows you to.
Classical music has _____ lasting value while folk has _____strong local colour.
Jane’s mother preferred _______TV at home to ______to the concert.
Last month, three thousand students took part in the _______ sports meeting.
If our government _____pay attention to the safety of food, our health _____in danger.