1,they were impressed because Ha Noi people were very....(friend)

2,we all know that using our car causes air...(pollute)

3,the giant panda is...(danger)

4 one of the things that make our country....(beauty)

5 they are going to...this road(wide)

6,teachers now give more...to their children(free)

7,he left...(disappoint)

8,all passengers must complete a visa from upon...at airport(arrive)

9, people can use the telephone to communicate with means of short message....chatting(communicate)