23. He is very smart and can always answer questions correctly.

22. She always wears/has a smile on her face and looks happy.

21. I like her bright, smiling eyes. They make her look really pretty and kind.

20. I do not know what I can do now. = I do not know what to do now.

19. I miss my classmates from my old school very much.

18. I know the school very well. = I know a lot about the school.

= I know much about the school.

17. I hope to become a famous singer and travel around the world in the future.

16. I am really happy to tell you about my future plans.

15. The Yellow River is the second longest river in China.

14. He is one of the nicest boys in my class.

　 Tom is one of the best students in our class.

　 The Changjiang River is one of the longest rivers in the world.