不明飞行物的英文缩写是 。
---How long has the train been away?---Sorry. I don’t know. By the time I got here, the train ________.
.---How can I get along _____with others, Dad?---Try to smile to others, boy. That will make ________much easier.
.---Tom is ill. When shall we go to see him, on Saturday or on Sunday?---_________. Either will do.
---Are you worried about the coming exam?---No, I think the more _________you are, _________mistakes you’ll make.
---Can you tell me something about your school rules?---Well, We are told ______anywhere. It’s our duty to keep our school clean and tidy.