Plastic bottles can be recycled but they need cleaning thoroughly, _______ they?

---_____ does she chat with friends on the Internet?--- Once a week.

--          is your cousin?--She's fifteen years old.

---- What do you think of the lecture made yesterday?---- Excellent! _______ you missed such a wonderful lecture?

—Nothing wrong with it, ____?—Yes. The computer says, “Please check this disk before entering data.”