We are well prepared for the exam now. Have you got prepared for the sports meet?

比较：be preparing for意为"在为......做准备"。如：

Bob is preparing for the exam. When I'm preparing for my performance, I don't like to be interrupted.

　③only后面跟介词短语、副词、状语从句位于句首时，引起部分倒装。

16．If our body is short of any of its kind, we will become sick.

　be short of作"缺乏，不足"解。例如：

They are short of nothing but time. 他们不缺任何东西只缺时间。

17．Even if we choose nutritious food for our main meals, we probably still need to refuel now and then.

　①even if=even though意为"即使"。如：

　　He will come even if he is ill. 即使病了，他也会来的。

　　Even if they offered to pay, I wouldn't accept any money from them.

　②now and then意为"有时（不时地），偶尔"，表示不经常发生（sometimes，but not often）如

　　I see him now and then, but not often. I like to go to the opera now and then.

18．We can give our body and brain more energy by eating snacks.

　①brain表示"大脑、头脑"时，既可以是可数名词，也可以是不可数名词，如：

　　He's nice, but hasn't got much brain（没有头脑） The man has a fine brain. 这人脑子很好用。

brain表示"头脑、智慧"时常用brains，此时为不可数名词。如：

　　Brains is more than just education. He has much brains.

19．Best of all, they taste great!

　best of all意为"最好的是，最突出的是"。如： Best of all, the medicine can help you sleep.

20．Most fruits are naturally sweet and we can eat them just the way they are-all we have to do is clean or peel them.

　①the way they are中的they are是定语从句，the way后接定语从句时，一般用in which引导，也可以省略，也可换成that。如：

　　These are some of the ways in which they can be used.

He doesn't speak the way (that) I do. 他说话方式不像我。