21. Confucius, many of whose ideas are just as ______ today as they were many centuries ago, is considered China’s most famous teacher and philosopher.

  A. vague          B. valid            C. vivid            D. vacant

22. A tennis tournament, which is open to both ______ and professionals, will be held at the Tennis Center to improve the fitness of the citizens,.

  A. adolescents        B. assistants       C. amateurs     D. audience

23. He ______ to the house as his “wonderland”, where he would spend hours daydreaming as a child.

  A. infers         B. prefers          C. transfers        D. refers

24. We raised some money to ______ a charity to help the struggling homeless in the flood-stricken areas.

  A. set up         B. set off          C. set out          D. set down