从短文后每小题的三个选项中选出能填入相应空白处的最佳选项。

    My1is Cathy. I often help my mother do the housework. Today is Sunday. My parents want2to visit a friend in London. I3at home by myself. I think I must do something for them, and they will be very happy when they come back. So I4my homework first, then I begin to do the housework. I feed (喂) the dog and5the plants. By eleven o'clock, I still need to make bed and wash clothes. There are also many other things to do, but I don't worry, because I can finish all the things before five o'clock in the afternoon.