$@Vân$
1. He is (clever) the cleverest student in my group.
2. She can't stay (long) longer than 30 minutes.
3. It's (good) the best holiday I' ve had.
4. Well, the place looks (clean) cleaner now.
5. The red shirt is better but it's (expensive) more expensive than being a builder.
6. I'll try to finish the job quickly
7. Being a firefighter is (dangerous) more dangerous than being a builder.
8. Lan sings (sweet) sweeter than Hoa
9. This is ( exciting ) the most exciting film I've ever seen .
10. He runs (fast) the fastest of all.
11. My Tam is one of (popular) the most popular singers in my country.
12. Which planet is (close) the closest to the Sun?
13. Carol sings as (beautiful) beautifully as Mary, but Cindy sings the (beautiful) most beautifully
14. The weather this summer is even (hot) hotter than last summer.
15. Your accent is (bad) worse than mine.
16. Hot dogs are (good) better than hamburgers.
17. They live in a (big) big house,but Fred lives in a (big) bigger one.
18. French is considered to be (difficult) more difficult than English, but Chinese is the (difficult) most difficult language.
19. It's the (large) largest company in the country.
20. Canada is far larger (large) than Vietnam.