The newly published book , which refers ____ basic English grammar , is ____ only for beginners .

When he came back, his wife was found _________.

Brian does work hard.—Yes. of his time been spent on studies every day.

What makes her so frightened?-Oh, it is the mouse that she ___ on her bad while looking for her watch．

I think ______ people drive, ______ air pollution there will be.—That’s true. I hope the air will be fresher soon.