839. I have a headache, and she has a stomachache.我头疼，她胃疼。

838. A clear conscience laughs at false accusation.只要问心无愧，无端的指责可以一笑置之。

837. You'll save time not waiting for the elevator.你可以节省等电梯的时间。

836. Wait a moment, I'll be with you in an instant.等一下，我立刻就来。

835. They are arguing over who should pay the bill.他们为谁应该付款而争论不休。

834. One third of this area is covered with forest.这一地区三分之一的地方都是森林。

833. Is this the fight bus for the Capital Library?这辆车到首都图书馆吗?

832. His words are strongly impressed on my memory.他的话深深地铭记在我的心头。

831. Will you connect this wire to the television ?你把这根电线和电视机连上好吗?

830. Whichever you choose, you won't be satisfied.不论你选择哪一个，你都不会满意。