—Hello, may I speak to Mr. Li?—Oh, sorry! He__________to Hong Kong. He will come back in three days.
— Could you tell me ____ for the meeting this morning? — Because the traffic was bad.
_________ trees have been planted these years.
— Peter, ________ do you visit your grandparents? — Twice a month.
The girl has friends here, so she feels lonely.
Hurry up, ________ you will be late for school.