—Excuse me, Liu Ming. Could you tell me what a UFO is like? —Sorry. Perhaps really knows whether there is a UFO in the world.
If everyone obeys the traffic rules, the road will ___.
The young man ___ the bike was so ___ that he had an accident.
He is late, ___ his bicycle is broken.
If your father ___ in a hurry, he will be late.
When you get on a bus, the conductor will usually warn you ___ a thief.