第二部分：语言知识及应用（共三节，满分50分）
第一节  单项填空（共15小题；每小题1分，满分15分）

21. Mr. Green asked Lily ________ she had written to her father _______.
A. whether; the day before      B. whether; yesterday
C. that; the day before          D. that; yesterday
22. Every minute is made full _______ of _______ our lessons well.
A. to use; study               B. use; studying
C use; to study                D. used; studying