基础检测
一、 1、They are living a comfortable life.
2、In the pas't，the roacls were narrow and dirty.
Now there are wide and clean streets，
with green trees on both sides.
3、Yes，there are. In the past，people lived in small old
houses. Now most of them live in new flats.
二、1、open
2、returned
3、communication
4、abroad
5、last
三、1、travelled around
2、to keep in touch
3、over the years
4、years ago
5、on his own
四、1、has already invlted me to
2、haven't rnet/seen each other
3、at primary school
4、have taken place
技能提升
一、1-5：B A D C A
二、略