—Time       . It’s likely that we will miss the bus.—Don’t worry. There are still 10 minutes left.

The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he  often mentions.

Taiyuan, a city in North China, was struck by a heavy snowfall last week, ______ serious traffic problems.

Jessica ought to stop work.She has a headache because she _______ too long.

 --- Did he notice you enter the room?　--- I don’t think so. He ______ to the radio with his eyes shut.