There was a time __________ the people in my village lived a peaceful life, enjoying the beauty of nature.
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Mark Twain worked for several years as a pilot on a steamboat, taking passengers up anddown the Mississippi, the great river ___flows from the north of the US near the Canadianborder.
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We’re talking about the piano and the pianist _____ were in the concert we attended yesterday.
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This is the biggest lab__________we have ever built in our university.
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My neighbors used to give me a hand in time of trouble, _______ was very kind of them.
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The days are gone________you can breathe fresh，unpolluted air or drink clean, unpolluted water in the countryside.
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