5. Her mother has been to Hong Kong several times. (就画线提问)

　　　　 ______　 _______　 ______ has her mother been to Hong Kong?

4.　　 I came here two days ago. ( 同义句)

I ______　 _______ here _______ two days.

3.　　 To understand the problem is very difficult. (用it 作为形式主语)

______　 ______ very difficult _______ understand the problem.

2.　　 Have you got a letter from Lucy? (同义句)

Have you ______　 ______ Lucy?

1.　　 They heard a message from a spacecraft. (用just改为现在完成时态形式)

They _____ just ______ a message from a spacecraft.

10.　 The bus _____ (go) . It left twenty minutes ago.

9.　　 Many girls are good at ______(make) things.

8.　　 The boy tried _____(climb) the tree, but he failed.

7.　　 Don’t forget _____ (close) the door when you leave home.

6.　　 The girl ______(go) to visit the city if it ______ (not rain) tomorrow.