Mum, my trousers are too old. I want to buy a new ______.

Mr. Bill always makes his class very lively and interesting. — You are right. No one teaches ____.

I haven’t got a camera.——I think you should buy_______. It’s useful for you.

_____ of them knows Japanese, so I have to ask a third person for help.—You’d better ask Tom for help. He is good at Japanese.

What’s matter _____ your computer? [ ]