1 longest 

2 bigger

3 biggest

4 taller

5 older

6 shorter/shortest

7 highest

8 tallest

9 longer

10 more interesting

11 more intelligent

12 short

13 biggest

14 more comfortable

15 worst 

16 more peaceful

17 clevers

18 more dilicious 

19 more boring

20 the most intelligent

II

1 the CD is more expensive than the cassette 

2 the church is older than the library 

3 Clare is the most popular than Andrew

4 the film is longer than videotage

5 going by train slower than going by car

6 Laura's room is more interesting than Mark's room

7 Matthew is stronger than Daneil

8 the street in the city is more crowded than the street in the countryside

9 the trains is more frequent than the buses