阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式(每空不多于3个单词)。
What should you do if you are not able to sleep? The best thing is to try to avoid bad habits．____ you always go to bed and get up at about the same time，this will set a __
__ (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__
__ (sleep) if you have a heavy meal just before you go to bed．
You may also find it difficult____ (get)to sleep if you have a problem or something else on your mind．This is __
__ you need to relax．As you lie in bed，tense the muscles in your feet and then relax _
__．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 __
__ (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__
__ book that is not too difficult．__
__，you may get so interested that you won’t want to go to sleep even when you feel sleepy．
Sleep welt and have sweet ____ (dream)!
I really want to see elephant close up. After that, we’ll be moving on to Tanzania,
we’re going to climb Mount Kilimanjaro. The African part of our trip will take about four weeks and we will surely have a happy time.
So, we’ll go white-water rafting, is quite dangerous, but very exciting! After white-water rafting, we’re going on a trip to see wild animals in Kenya.
we’ll be walking for almost two weeks, I’ll need to buy a large, strong, light backpack
advance to carry my supplies of food and water.
We will leave London on 15 July, and we’ll be flying to Morocco. We are going to travel on camels the Sahara Desert.
It seemed that the water led to cholera．John Snow looked into the source of the water for these two streets．He found that it came from the river, had been polluted by the dirty water from London．Immediately John Snow told the astonished people in Broad Street to remove the handle from the water pump so it could not be used．Soon the disease began to slow
．
John Snow had shown that cholera was spread by germs and not in a cloud of gas．___ addition, he found two other deaths in another part of London that were concerned with the Broad Street outbreak．A woman, who had moved away from Broad Street, liked the water so much that she had had it delivered from the pump to her house every day．
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