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Ex3:

1.the oldest 

2.the best 

3.the worst 

4.the most intelligent 

Ex4:

1.the most intelligent student in my class 

2.the happiest person we have ever met. 

3.the most interesting sport 

4.the bigger hat than this one? 

5.the highest mountain in the world 

6.the fattest in my class 

7.is richer than mr. Ron 

8.the best in English in our group. 

@tunguyen09 

Ex 3:

1. one of the oldest castles

2. one of the best players

3. one of the worst experiences

4. one of the most intelligent students

Ex 4:

1. the most intelligent in the class

2. the happiest I've seen

3. the most interesting sport

4. the biggest hat

5. the highest mountain in the world

6. the fattest in the class

7. in our town is richer than Mr.Son

8. the best at English in my group