How old is your son? — Five.—We will have a special party for his birthday .

What’s this?—It’s a machine which was invented in __________century in China.

Do you know the man wearing a pair of glasses?——-Yes.He’s a teacher of _________.He teaches _________history.

Excuse me , Sir . But smoking is not allowed here. —Sorry, I didn’t see the sign. I’ll ___________________ my cigarette at once.

_________ are good friends. We often play together.