—Would you mind giving your advice on how to improve our efficiency? —If you make _____ most of forty-five minutes classes day after day, there will be _____ switch in grades.
1. shade A. behave B. shadow C. considerate D. battle
2. crowd A. slow B. window C. allowD. row
3. actor A. worth B. therefore C. export D. doctor
4. reduce A. chemical B. regret C. generationD. intend
5. nutrition A. struggle B. support C. summaryD. confuse