问题描述：
Many people said our earth is completely polluted.Things are not as bad as they say.We’ll have a bright f_____1_____.We don't need to give up cars but we need to i_____2_____ better,cleaner engines.
This won’t stop the problem of traffic j_____3_____.So we need better public transport.We should also recycle more.
But some things are getting b_____4_____.My sister returned last month after living a_____5_____ for five years.She said,“Our old neighborhood doesn't look the same as before-it is cleaner and greener now”
S_____6_____has brought many improvements.A hundred years ago,most people died in their 40s.We can’t go back to a l_____7_____ like that.
1.____________ 2.____________ 3.____________ 4.____________
5.____________ 6.____________ 7.____________
This won’t stop the problem of traffic j_____3_____.So we need better public transport.We should also recycle more.
But some things are getting b_____4_____.My sister returned last month after living a_____5_____ for five years.She said,“Our old neighborhood doesn't look the same as before-it is cleaner and greener now”
S_____6_____has brought many improvements.A hundred years ago,most people died in their 40s.We can’t go back to a l_____7_____ like that.
1.____________ 2.____________ 3.____________ 4.____________
5.____________ 6.____________ 7.____________
问题解答：
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