He began to take political science ________ only when he left school.
The train _____ at the present speed until it reaches the foot of the mountain at about nine o’clock tonight.
The plane _____ at 7:00 p.m., so I have to be at the airport by 6:40 at the latest.
— Did he notice you enter the room?— I don’t think so. He _____ to the radio with his eyes shut.
— Tom, did Mr. Li join you in your discussion?— No, he _____, but he happened to have fallen ill.
— What do you think of this kind of TV set, which _____ in Shanghai?— Well, I don’t care such things.