The girl in the classroom ______ be Maria. She called me from the library just now.
You will fall behind others ____________ you work hard.
H7N9 bird flu is a virus can make people die. We’d better stay away from birds at present.
--- Could you tell me __________?--- Certainly. In half an hour.
--- Mum, why don’t you have the robot ________ housework for you?--- Oh, it caught a virus. I should have it _________ at once.
―Did you see Mr. Li when you were in France?―No, when I ______, he ______ to Canada.