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Pipes made of plastic are now widely used in building as they are light and do not become （）in water.
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Jessica（）her father on the knee and asked him not to worry about his health.
They were under the（）that the company was doing well, but in fact it was in serious trouble.
The United Nations Conference on Global Environment, which took place earlier this year in Vienna, was a very（） meeting.
The local government tried its best to ensure each of its citizens a（）supply of food at regular intervals （时间间隔).
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