____ do you clean the classroom?— Three times a day.

Billy: I’ve been fixing the computer for over three hours, but it still doesn’t work. Nana: Why don’t you take a rest and try ? Maybe you’ll do better then.

We’ll study in different schools next term. Enjoy your time in the new school.— .

Why didn’t you go to the cinema with us yesterday evening? —I________for my uncle from Beijing at the station.

Look, what have they done? —Sorry. I think if I __________ another chance, I’ll do it better.