I 1 longer - clean

2, more expensive

3, quickly

4, more dangerous

5, sweeter

6, hotter

7, worse

8, better

9, more difficult

10, faster

II. 1, most popular

2, the closest

3, the tallest

4, the best

5, the coldest

6, the most dangerous

7, the happiest

8, the nicest

9, the biggest

10, the most famous

IV 1. prettier

2. best

3. most richest

4. happiest

5. most popular

6, most dilicious

Bài 1:

1)She can't stay longer than 30 minutes. Well, the place looks clean now.

2)The red shirt is better but it's more expensive than the white one.

3)I'll try to finish the job quickly. 

4)Being a firefighter is more dangerous than being a builder.

5)Lan sings sweeter than Hoa.

6)The weather this summer is even hotter than the last summer.

7)Your accent is worse than mine.

8)Hot dogs are better than hamburgers.

9)French is considered to be more difficult than English.

10)A cheetah is faster than a horse.

Bài 2:

1)My Tam is one of the most popular singers in my country.

2)Which planet is the closest to the Sun?

3)Who is the tallest person in your family?

4)My mum is the best cook in the world.

5)December is the coldest month of the year in my country.

6)What's the most dangerous animal in the world?

7)Ethan is the happiest boy that I know.

8)Where are the nicest beaches in your country?

9)She bought the biggest cake in the shop.

10)Who is the most famous singer in your country?

Bài 3:

1)Susie is prettier than the other girls

2)This is a really good school. It's one of the best schools in the North West.

3)She is by far the richest woman in the world.

4)School days are supposed to be the happiest days of your life but I don't agree.

5)What is the most popular sport in your country?

6)That was a really good meal, probably one of the most delicious I have ever eaten.

Mình chép xong cho bạn là mình gãy tay luôn rồi đó nên mong bạn học tốt nha:)