下列各句中，加点的词语运用正确的一项是（　　）

said he could fix my bicycle, but I really doubtit—_______ He’s very good at this sort of thing

Xiao Li was supposed __________ her homework before nine o’clock. But she couldn’t.

The traveling magazine________ me $ 20 .

Time is limited. I have to finish this tonight.—But it’s midnight now and you should have a sleep ______ much work you have to do.