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)no
问题描述：
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.
答
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.