B
Ex2
2 It is a library
3 It is a railway station
4 It is a gym
5 It is a square
6 It is an art gallery
Ex3
1 colder
2 more dangerous
3 more important
4 narrower
5 faster
Ex4
1 than he used to be
2 than it was when I bought it
3 she was a child
4 than I was before
5 than they were ten years ago