IV/
1. is not as big as her old one
2. Peter is the tallest in my class
3. is cheaper than the black one
4. is more difficult than English
5. Mary is the most intelligent in my group
6. is the longest river in the world
7. in the world is higher than Mount Everest
8. the prettiest girl I have ever met
9. The more he works, the more tired he feels
10. doesn't work as well as this one
V/
1. for
2. out
3. of
4. at
5. on
6. in
7. in
VI/
1. collection
2. inconvenient
3. skillful
4. unsafe
5. friendly
healthily
IV.1. Her new house is older than the old one.
2. Peter is the tallest in my class.
3. The write dress is cheaper than the black dress.
4. According to me, Maths is harder than English.
5. Mary is the most intelligent in my group.
6. The Nile river is the longest river in the world.
7. No mountain in the world is higher than (the) Mount Everest.
8. She is the prettiest girl I have ever met before.
9. The more he works, the more tired he feels.
10. That computer works worse than this one.