一、1、abroad
2、conditions
3、waste
4、recently
5、situation
6、However
7、realized
8、interview
二、1、return
2、environment
3、life
三、1 - 5 A A C D D
6 - 10 D B B D B
四、1、to be
2、has, fallen
3、to help
4、have, phoned
5、staying
6、have made
7、caught
8、has happened
9、are preparing
10、have worked
五、1、She feels lonely from time to time because she lives alone.
2、They can't see their old friends as often as before.
3、Has your dad come back/returned from America yet?
4、This is the most exciting film I have ever seen.
5、His wife has worked in that shoe factory for five years.
6、They have taken action(s) to stop these factories (from) putting/ pouring waste into rivers.