21. His answer was so _________ that I was ______ and didn’t know how to fight him back.
 A. amazed, amazing   B. amazed, amazed C. amazing, amazing   D. amazing, amazed
22. ______ it is to jump into a river to swim on such a hot day.
   A. What a fun       B. How funny       C. What fun   D. How a fun
23. Please pay attention to the ___________ for using the medicine.
 A. direction         B. orders             C. instructions           D. words