Cái này dễ mà ^^
Exercise 2.
1. She smiled happier than before.
2. Could you write more clearly?
3. Planes can fly higher than some kinds of birds.
4. He had an accident last year. Now he drives more carefully than before.
5. Jim can runs faster than John.
6. Our team play the most badly of all.
7. He worked hardet than everyone.
8. I don't know more people in our neighborhood as you do.
9.The teacher speaks English more fluently than we do.
10. She learn English better than me.

Exercise 4.
1. Of the four four shirts. I like red one thr best.
2. He speaks English the most fluently in my class.
3. He can write the most beautifully.
4. She sings the best.
5. Peter runs the most quickly in his class.
6. He does test the most carefully in his class.
7. They work hardest in our village.