851. We are all taking medicine against the disease.我们都服药治疗疾病。

850. This way, he can kill two birds with one stone.这样他就能两全其美。

849. They have to work hard to support their family.他们必须努力工作来支持他们的家。

848. There are a lot of people in the swimming pool.游泳池里挤满了人。

847. Please ask her to call me back when she"s back.她回来时请让她给我回个电话。

846. No wonder you can"t sleep when you eat so much.你吃这么多难怪睡不着。

845. Learn to say the fight thing at the fight time.学会在适当的时候说适当的话。

844. I"m afraid I have some rather bad news for you.我恐怕有些很坏的消息要告诉你。

843. I left at 6:00 so that I could catch the train.我六点钟出门，以便赶上火车。

842. I can"t afford to go to a restaurant every day.每天都去餐馆吃饭，我真是支付不起。