用括号了适当的形式填空.1.Great changes__(take

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用括号了适当的形式填空.1.Great changes__(take place)since liberation.2.It" not polite__(laugh)at people.3.A new hospital__(build)now.4."9.11"__(can"t forget) by the people all over the world.

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  • 1.Great changes have taken place since liberation.2.It' not polite to luagh at people.3.A new hospital is being build now.4."9.11" can't be forgotten by the people all over the world.