Remember this: ________ careful you are, ________ mistakes you will make.— We know, Miss Gao.

Do you often watch Man and Nature on TV?—Sometimes. It’s an interesting program, but I ______ Sports News.

How his weekend?—Not too bad. He stayed at home and watched TV.

Listen! Is that Linda singing in the next room?— No, it ________ be her. She is still in Shanghai.

Teachers often tell us in the river after school.