一、1、primary
2、condition
3、communicate
4、environment
5、recently
6、last
7、transport
8、returned
9、Exactly
10、abroad
二、1 - 5 C A B A D
6 - 10 D B A A B
三、1、has eaten
2、will visit
3、have lent
4、was cooking
5、have, been
6、have kept
7、not to repair8、have collected
四、1、The Internet has made communication much easier.
2、Our living conditions have changed a lot over the years.
3、Now they are/get used to living in the flats.
4、It's not easy to get/be used to the changes of life quickly.
5、Do you often keep in touch with each other by email?
五、1 - 5 D A B B C
6 - 10 A C B D A