You should when your parents aren’t at home.

I got to the party late. By the time I arrived, somepeople ______ home already.

I can’t stand the weather. I would like to take off my shirt. — Hehe…the weather report says it will be much tomorrow.

Only by learning more about differentcultures _______ avoid misunderstanding during international cooperation.

It was April 29, 2011 ______ Prince William and Kate Middleton walked into the palace hall of the wedding ceremony[ ]