Are Mr. and Mrs. Wang living alone in the house? —Yes, they have three sons, but ______ of them live in their own houses.

He is_____American.　I’m_____English.

Don’t ________too late,or you will feel tired in class. –I won’t ,Mum.Good night!

It’s that time ________ year again. [ ]

Simon has gone abroad to have ____________ European tour.— Oh, really? It must be ____________ unusual trip for him.