515. Susan is going to finish college． 苏珊将完成大学学业。

514. Patience is a mark of confidence. 耐心是自信心的一种表现。

513. Let"s divide the cake into three． 我们将蛋糕分成三份吧。

512. It"s very kind of you to help me． 你帮助我真是太好了。

511. It"s a secret between you and me. 这是你我之间的秘密。

510. Is there any sugar in the bottle? 瓶子里还有糖吗?

509. I"ll call a taxi in case of need． 如果需要的话，我会叫出租车的。

508. I won"t be able to see him today. 今天我不可能去看他。

507. I have a large collection of CDs. 我收集了很多唱片。

506. I go to school by bike every day. 我每天骑自行车上学。