Ответ:
Задание 2
2) was
3) weren't
4) were
5) are
6) isn't
7) is
8) aren't
Задание 3
Fifty years ago, there weren't a lot of cafes, shops, even cinemas in my town. There was USSR then. Actually I don't know about availability of buses in my town fifty years ago, but maybe there were a few.
Now there are a lot of cafes, shops, malls, cinemas in my town. Now there isn't USSR in the whole world :) There are lots of buses in my town nowadays.