Someone is knocking at the door.（英译中)

The door is made of oak.（英译中)

Did you hear the knocks at the door？（英译中)

I （)supper when I（)someone knocking at the door.A、made . . . HeardB、made . . .was heard

The lecture is to be delivered at the hall.（英译中)

I _________ （watch) TV when someone knocked at the door．

She _____ go to bed when someone knocked at the door .A.was about toB.is about toC.was