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What will the city of the future look like? No one knows for sure, and making1.______(predict) is a risky business. But one thing is certain-they are going to get bigger before they get smaller. In the future, care for the environment will become very important 2._______earth’s natural resources run out. We will use lots of3._______(recycle) materials, such as plastic, steel, glass, wood and paper, and we will waste fewer natural4._______.We will also have to rely more5. _______ alternative energy, such as solar and wind power. All this seems certain, but there are plenty of things about city life in the future 6. _______ are not certain.

高一英语单词拼写困难题

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