20．A.shops

　　B．experiments

　　C．businesses

　　D．restaurants

　　解析：选B　根据最后一句中“may hopefully result in many more”可知，作者希望这样的做法会越来越多。由此可知，此处应指服务员询问作者微笑卡的相关信息，他们也想模仿作者的这种做法。故选B项。

　　Ⅱ.语法填空

　　(2016·太原二模)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 at 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 __8__ book that is not too difficult. __9__， you may get so interested that you won’t want to go to sleep even when you feel sleepy.

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