My mother every morning.

________hard you try，it is difficult to lose weight without cutting down the amount you eat(2012·湖南，32)

The box is too heavy to carry. What’s in it —Oh, I _________ it ________books.

Hey,man. You can’t cross the street now. You have to wait ___the traffic lights turn green.

下列各句中没有语病的一句是（ ）