691. It is no use learning without thinking.学而不思则惘。

690. If you would only try, you could do it.只要你肯尝试，你一定能做这件事。

689. I have just heard from my sister, Mary.我刚收到我妹妹玛丽的一封信。

688. I fell in love with her at first sight.我第一眼见到她就爱上了她。

687. I don"t like what you are saying.我不喜欢你说的话。

686. I don"t know if I"ll have the patience.我不知道我有没有耐心。

685. I can"t make this machine run properly.我无法使这部机器正常运转。

684. He hired a workman to repair the fence.他雇用了一个工人修理围墙。

683. He has to take care of his sick mother. 他得照顾他生病的母亲。

682. Could I have those two tickets, please?这两张票给我行不行?