611. Nobody has ever solved this problem． 没有人曾解决过这个问题。

610. May I know the quantity you require? 请问你们需要多少数量的货物?

609. Let us do it by ourselves，will you? 我们自己做这件事，可以吗?

608. In a word，I am tired of everything． 总之，我对一切都很厌倦。

607. I"d like to get this film developed． 我要冲洗这卷胶卷。

606. Ice cream is popular among children． 冰淇淋深受孩子们的欢迎。

605. I will seek from my doctor"s advice． 我将请教医生的意见。

604. I learnt that I had passed the test． 我获悉我测验及格了。

603. I doubted whether the story is true． 我怀疑那故事是不是真的。

602. I bought it the day it was released. 它发行的当天我就买了。