I/
1. B
2. A
3. C
4. D
5. Đề không gạch chân nên không biết
II/ 
6. Tom is older than his brother
7. This problem is easier than that problem
7. John is the tallest boy in our class
8. My friend is fatter than my sister
9. My room is the most comfortable room in our house
10. Konya is the largest city in Turkey
11...the longest river...
12...more popular...
13...better than...
14....larger than...
15...the most beautiful...
16...the most talkative...
17...the most interesting...
18...the most humorous...
III/
19....the best...
20....as expensive as...
21....easier...
22....better...
23....heavier...
24....more suitable...
25....most popular....
IV/
26. teeth
27. 20nd
28. shopping
29. teachers
30. students
31. third
32. musician
33. knives
34. farmers
35. twice
36. age
37. children
38. teeth
39. drives
40. writer

I
1.B
2.A
3.C
4.D
5.C
II
6.Tom is older than his brother
7.This problem is easier than that problem
7.John is the tallest boy in our class
8.My friend is fatter than my sister
9.My room is the most comfortable room in our house
10.Konya is the largest city in Turkey
11.the longest river
12.more popular
13.better than
14.larger than
15.the most beautiful
16.the most talkative
17.the most interesting
18.the most humorous
III
19.the best
20.as expensive as
21.easier
22.better
23.heavier
24.more suitable
25.most popular
IV

26.teeth
27.20nd
28.shopping
29.teachers
30.students
31.third
32.musician
33.knives
34.farmers
35.twice
36.age
37.children
38.teeth
39.drives
40.writer