Which is your teacher?—The one _ thickglasses over his eyes is.[ ]

I don’t like ______ hamburgers. I’d like ______ cakes.

A: ________ photo would you like to hang on the wall, the one with John or the one on the beach?B: I like the one on the beach better.

David talked with a friend of ____ on the Internet for a long time yesterday.

Although Maths is very difficult, you can’t .