12_________ 5 makes 7 [ ]

_________ advertisements are of great help, I don’t think we should entirely rely on them

Did you have niceholiday—Yes，it was best holidayI，veever had.

ot accustomed to _______when studying orworking, so please remember this and don’t do it again.

There’s someone knocking on the door. Who _________ it be?—It must be John. He promised to be here at 8:00.