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阅读短文,从方框中选择合适的词语,并用其适当形式补全短文。 but, take pla ce, in the past,

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阅读短文,从方框中选择合适的词语,并用其适当形式补全短文。
but, take pla ce, in the past, go to work, used to be
     Over the past ten years, great changes (1)________ in our hometown. (2)________, the houses in
our hometown were very old , (3)________ now most of the people have moved into tall buildings. The
water in the river (4)________ very dirty, but now the river is very clean, and we can swim in it. People
he re used to walk or ride bikes, but now they can take buses or drive their own cars (5)________.
1. have taken place   2. In the past   3. but      
4. used to be   5. to go to work