someone is knocking at the door.___must be Tom.为什么用he而不用it?
someone is knocking at the door.___must be Tom.为什么用he而不用it?
Someone is knocking at the door.Who it be?— It be Tom.He is
-----Someone is knocking at the door.It ____ be Tom .
Someone is knocking at the door.It be Tom because he Shangha
someone is knocking at the door.It might be the posyman.为什么用
Someone is knocking at the door._must be Tom
someone is knocking at the door.who [ ]it be?
---someone is knocking at the door.Who _____ it be?
who is knocking on the door ___must be Helen.
Someone is knocking at the door.____ is it?
There is someone knocking at the door.为什么用“knocking”,要加“ing”
Someone is knocking at the door.___ it be Venis?—No,it ___ b