555. She is poor but quite respectable． 她虽穷，人品却很端正。

554. Once you begin，you must continue． 一旦开始，你就得继续。

553. Money is no more than our servant． 金钱不过是我们的仆人。

552. Its origin is still a mystery now． 它的起源至今仍是个谜。

551. I"d like to look at some sweaters． 我想看看毛衣。

550. I would rather stay at home alone． 我宁愿独自呆在家。

549. I think you have the Wrong number． 我想你打错号码了。

548. I really need to lose some weight． 我真的需要减肥了。

547. I expect to be there this evening． 我打算今天晚上到那儿去。

546. His boss might get angry with him． 他的老板也许会生他的气。