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。

505. I count you as one of my friends 我把你算作我的一个朋友。

504. He inspected the car for defects． 他详细检查车子有无效障。

503. He has been sick for three weeks． 他已经病了几周了。

502. You know what I"m talking about. 我想你知道我在说什么。