When you hear a knock on the door,what will you say?用who is

When you hear a knock on the door,what will you say?用who is can you hear someone _____(knock) on the door now Did you hear someone[ ] 【knock】 at the door when you[ ]【 wat Did you hear someone knock at the door A knock on the door!Who --it be? you must ____(knock)on the door before you enter Please ____(knock)at the door when you come in. Who is_______(knock)on the door? always knock on the door before you enter Would you please ____________(not knock)on the door? Please knock on the door ( )you came into the room A after B when .who .go .miss .a .you .you .on .trip .will