Exercise 3:

1. one of the oldest castle

2. one of the best player

3. one of the worst experience

4. is one of the most intelligent student

Exercise 4:

1. Lan is the most intelligent person in my class.

2. He is the happiest person we have know.

3. Football is the most interesting.

4. Have you got the biggest hat ?

5. Everest is the highest mountain in the world.

6. Minh is the fasttest in my class.

7. No one in our town is richer than Mr Ron.

8. Lan is the best at English in my group.

Ex3:

1. one of the oldest castle

2. one of the best player

3. one of the worst experience

4. one of the most intelligent student

Ex4:

1. Lan is the most intelligent student in my class.

2. He is the happiest person we have known.

3. Football is the most interesting.

4. 

5. Everest is the highest mountain in the world.

6. Minh is the fattest student in my class.

7. No one in our town is richer than Mr Ron.

8. Lan is the best at English in my group.