题目内容
The last paragraph is mainly about _____.
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To reduce emissions of greenhouse gases, many countries are increasing the use of natural gas, wind and other forms of _____ energy.
—Do you know anything about the Trade Union Dinner? —Yes, we _____ an official invitation.
Experts insist that packets of cigarettes come with a health warning _____ to them.
It was almost 8 years later _____ the young man got his doctor’s degree and became an engineer.
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