第二部分：客观题
一、单项选择。（10分）
21. Max is _______honest boy. He has _______ useful book.
A. an; an B. a; a C. a; an D. an; a
22. Of all the family members, my mother is _______.
A. the busier B. the busiest C. busiest D. the busyest
23. Shanghai is bigger than _______in Sichuan and bigger than _______in China.
