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Don’t play with the dog, Jack, for it ______ be dangerous at times.

— Peter was admitted to a second－class college.
— He ________ a top university, but he was addicted to playing computer games.

— I am going to the dentist at 4 o'clock and it is 3：30 now.
— Well, if you ______ leave earlier today, please ask the director for permission.

One of the rules is that every student ________ wear school uniform while at school.

—Must I return the book tomorrow?
—No, you ________.You can keep it for three days.

I __________use a clock to wake me up because at six o'clock each morning the train comes by my house.

The new law states that people _______drive after drinking alcohol.

—I visited France last year.
—That         interesting.

—Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading.
—Don’t worry. You know, sometimes the Internet ________ be very slow.

— The terrible accident is under investigation.
— Actually, quicker action _________ those workers trapped in the mine.