I．题目略。
1．an hour ago
2．used to
3．as often as before
4．all one's life
5．move house
6．in the northern part of...
7．get married
8．in the town centre
9．Turn…into…
10．in some ways
11．feel a bit lonely
12．from time to time
13．since then
14．learn a lot about…
15．on one s own
16．over the past century
17．the history of China
18．go abroad
19．keep in touch with sb
20．be/get used to
Ⅱ．题目略。
1．just 2．situation 3．environment 4．primary 5．ever
6．ionely 7．However 8．interview 9．present 10．since
Ⅲ．题目略。
1．northern 2．wives 3．hasn't come 4．have grown 5．recently
6．pollution 7．impossible 8．be 9．married 10．have changed
Ⅳ．题目略。
1．has turned into 2．used to play
3．moved to; two years ago 4．communication; easier
5．feel lonely 6．get married
7．as often as before 8．keep in touch with
9．Water pollution 10．have learned a lot from