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英汉互译：故宫

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用所给单词的正确形式填空：Electricity is a basic part of nature and it is one of our most widely used forms of energy. Before electricity ______ (discover) over 100 years ago, houses were lit with kerosene lamps, food (cool) in iceboxes, and rooms (warm) by wood-burning or coal-burning stoves.Electricity _ (make) our lives easier. Right now, most of our electricity _____ (come) from burning fossil fuels (oil, natural gas, and coal). The problem is that fossil fuels will eventually run out. If we want to keep using our televisions, air conditioners, microwave ovens, and computers, we need to find another way to make electricity.

将本句改为被动语态，每空一词：People use knives for cutting things.Knives for cutting things.

将本句改为被动语态，每空一词：The students clean the windows of their classroom twice a month.The windows of their classroom _ twice a month.

将本句改为被动语态，每空一词：I found the ticket on the floor. on thefloor.