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 the white one. 
6. I’ll try to finish the job (quick).………quickly…………….
7. Being a firefighter is (dangerous) ………more dangerous……………. than being a builder.
8. Lan sings ( sweet ) ……sweetlier …………..than Hoa
9. This is (exciting) ……the most exciting ………………. film I’ve ever seen.
10. He runs ( fast )………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) ………beautifulliest…………….
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 dificult…………….language.
19. It’s the (large)…………largest…………. company in the country.