—How many times _____ he _____ NanChong? —Twice. A. has, gone to B. has, bee to C. has ,been in
Our parents often tell us ___________ on the street.
— We’d better go home right now. The sky is getting . — Okay, let’s go!
While I _____________, someone ___________at the door.
They ____________ in the river when it __________ to rain.
Please knock at the door ________ you come into the room.