现在重要的不是找到一个方法，而是找到一个既有效又无风险的最好的方法。

　　10．Here are some ways in which people can help keep_water_from_being_polluted.(keep)

　　下面介绍一些人们可以用来防止水受到污染的方法。

　　.完形填空

　　(2017·黄山模拟)One day I was doing a big clean­up when I __1__ a knotted handkerchief with an old dark brown coin inside. I took one look and immediately __2__ an unforgettable time.

　　In 1991, I had spent five months in Niger, with sandstorms and great heat. Its __3__ and beggars were my biggest and most constant complaint. Street beggars would continually reached out their hands, shouting “Gift! Gift！”

　　One day, I __4__ for neighboring Burkina to work in a health clinic.

　　Arriving by taxi at our destination in Burkina, we began to __5__. Out of the darkness, a motorbike with two men approached slowly. Without __6__， one of the men grabbed my bagpack as the motorbike swept close by. Within seconds, the two were out of sight, __7__ up by the night.

　　The bag had my passport, money, traveler's cheques, camera, an airline ticket and other things __8__ to me. I was in deep trouble.

　　In the weeks that followed, I __9__ guarded the rest of my valuables and regarded all __10__ with suspicion. All I wanted was to leave this place.

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