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John Snow was a well-known physician in London. At that time, cholera was deadly disease and thousands of people died of it. People didn’t know its cause or its . John Snow determined to face the and solve the problem. another outbreak hit London in 1854, he gathered information and made a map, (mark) the exact places where all the dead people had lived. Through further investigations, he discovered that the water was to , because it was polluted by the dirty water from London. supporting evidence, John Snow announced that polluted water carried the germs. To prevent this from again, John suggested that the source of all the water supplies (examine) and new methods of (处理) polluted water be found. Thus cholera was defeated in the end.

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Whether you are a fan of athletics or not, chances are _____ you have heard of Usain Bolt--- the fastest man on the planet.
After the 29-year-old Jamaican had won victories in the 100- and 200-meter men’s dashes, Aug 29 saw him take home a third gold medal in a week at the 2015 World Athletics Championships in Beijing, ____ (lead) his national team to victory _____ the men’s 4× 400 relay final.
____ Reuters put it, “When _____ comes to major championship sprinting(短跑)，Bolt simply has no equal.”This partly explains why the sprinter always ______ (wild) celebrates his wins. After each match, he does the trademark “Lightening Bolt” pose---putting one arm into the sky, as if he were about to throw a bolt of lightning at the stars. ______ 2012 London Olympics also saw him look back across the track at his competitors , do a couple of push-ups (俯卧撑)once he had stopped.
Some have called him a “showman”, but“ these will just add to the charm of Bolt---one of the most ____ (joy), self-confident athletes you’ll ever see”, wrote the Business Insider.
Indeed, now with six Olympic gold medals and 11 World Championships titles under his belt, the Jamaican star ____ (prove) “his ability to get the ____ (good) out of his huge natural talent”, Reuters noted.

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Tom and Jack are good friends. They have dreamed about _____( take) a great bike trip. It was Tom who first had the idea to cycle ______the entire Mekong River. They _____ (ride) bicycles to travel along the Mekong River, ______source is in Qinghai Province. When it enters Southeast Asia, it travels slowly through low valleys to the plains, _____ rice grows. ______ the difficulties , Tom and Jack were determined to begin their journey at an altitude of _____( much) than 5,000 metres in Qinghai Province. During their journey , they enjoyed the continuous change of the weather. _____(finally), they reached Dali in Yunnan Province , where David and Sam joined____. ____ four of them went on with their great bike trip.

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Singles’ Day falls on November 11th every year in China, ________ is recognized as a day for people who have no girlfriend or boyfriend. Couples and lovers have Valentine’s Day in _______ (celebrate) of their love, but how about the singles? There must be a day they can celebrate even without a partner. That’s _______ people created Singles’ Day.
On Singles’ Day many singles choose to say goodbye to their single lives, ________ (attend) blind date parties, and some people even decide to get ________ (marry) to strangers. _______ this day has recently become more of a time for shopping, because many shops online will give customers great discount ________ (promote) their goods.
More and more people are ________ (will) to shop online to get what they want, and I am one of them. I just can’t help buying things ________ I need them or not.________ (honest) speaking, some of the things that I bought have been put aside forever in my closet.

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Many of us were raised with the saying “Waste not, want not.” None of us, however, can (complete) avoid waste in our lives.
Any kind of waste is thoughtless. Whether we waste our potential talents, our own time, our limited (nature) resource, our money, other people’s time, each of us can become more aware and careful. The smallest good habits can make a big (differ). It’s a good feeling to know in our hearts we are doing our best in a world is in serious trouble. By being devoted to (save) oil, water, paper, food, and clothing, we are playing part in cutting down on waste.
We must keep reminding (we)that it is easier to get into something than it is to get out of it. Actually, severe damage (do) to our land is fairly recent in the history of our evolution. It’s time for us to say no to waste so that our grandchildren’s children (be)able to develop well. We can’t solve all the problems of waste, but we can encourage mindfulness.