—Who is playing the piano in the music room? Is it Mary?
—No, it ________ be her. She has ________ to Beijing on business.
couldn’t; been
can’t; gone
can’t; been
mustn’t; gone
. —He hasn’t told me when he the ticket.—Don’t worry. He will give it to you when he it.
Newspapers much useful information every day. When you arrive at a new place, buy a newspaper first.
—What does a doctor say if you caught a cold?—Don’t worry. .
There will be a stamp show in the museum we visited last week.
—Why don’t you tell me ?—I don’t know either, so I can’t tell you .