20．A.anything

　　B．nothing

　　C．everything

　　D．something

　　解析：选B。句意：一旦你把自己当成有担当的大孩子，就没有什么能够阻挡你成功。nothing意为“没有什么东西”，符合语境。故B项正确。anything意为“任何东西”；everything意为“一切”；something意为“某样东西”，均与语境不符。

　　Ⅳ.语法填空

　　(2016·太原市高三年级模拟考试)What should you do if you are not able to sleep? The best thing is to try to avoid bad habits.

　　1.____________

　　you always go to bed and get up about the same time，this sets a 2.____________ (health) rhythm in your life. Don’t drink caffeine drinks in the evening. Smoking and alcohol can also keep you awake. You may have trouble

　　3.____________ (sleep) if you have a heavy meal just before you go to bed.

　　You may also find it difficult

　　4.____________ (get) to sleep if you have a problem or something else on your mind. This is

　　5.____________

　　you need to relax. As you lie in bed，tense the muscles in your feet and then relax

　　6.____________. Continue up the body，tensing and relaxing the muscles until you reach the head. Start with the feet again if you are still tense. If you

　　7.____________ (think) about a problem or about something exciting that is going to happen the next day，get up and write about it. That will help to take it off your mind. You can also get up and read，but be sure to choose

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