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
23. Mr. Black ___ Shanghai in a few days. Do you know when the earliest plane ____on Sunday.
A. leaves; takes off B. is leaving; takes off
C. is leaving; is taking off D. leaves; is taking off
