1. What words and expressions from the passage have you used to tell these stories?
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英语语法填空考点：be used to do与doing辨析教材例句证明
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2. I used to think it was easy to get clean water.
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3. The strong, or stressed, pronunciation is less common as it is used to emphasise the most important words in a sentence.
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4. The passive voice in the past perfect tense is used to express an action completed before a past time.
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5. In some cases, in a broad sense or in a narrow sense is used to make the definition more accurate.
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6. This crocodile is used to passengers throwing food from boats and now she is becoming familiar with humans.
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7. Smog comes from the words "smoke" and "fog", and it is used to describe the air pollution in cities caused mainly by traffic and factories.
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8. Mars has plenty of metals and rock, and probably lots of water, but no wood or petroleum, which is used to make petrol, plastic and many other useful products.
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