Listen!there`s a k______ at the door .who is it '

Listen!there`s a k______ at the door .who is it ' Listen!Who is knocking at the door? there is ( ）knocking at the door.GO and see who it is A nobo someone is knocking at the door （）i go and see who it is A s Who's that at the door?____ is the postman.A.She B.This C.It --who's that at the door?--____ is a postman. --Listen! Someone is knocking at the door. Who _____it be? ---Listen! Someone is knocking at the door. Who _____it be? Listen!There's someone_____(knock)at the door. listen there is a knock at the door 改为同义句 There is somebody at the door .I go and see who it is . 21页7.Listen ,there is a knock ------the door .It must be Tom