题目内容
The sun is our energy source, and ______ it we would not be able to survive.
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Nowadays, almost every householdhas different kinds of electrical _________ to relieve manual labor.
He studied hard at school when he was young, ______ contributed to his success in later life.
You shouldn’t get angry just _________ some people speak ill of you.
The faster anything is thrown into the sky, _________ it goes.
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