561. We often call him by his nickname． 我们经常叫他的绰号。

560. To be honest with you，I"m twenty． 老实说，我20岁。

559. They employed him as a consultant． 他们雇用他为顾问。

558. There is a chair below the window． 窗户下面有一把椅子。

557. The girl in red is his girlfriend． 穿红衣服的那个女孩是他的女朋友。

556. She spent a lot of money on books． 她花了很多钱来买书。

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。