【正文】
60。C.whenD.until【答案】 D 8.—Mom, I want to be an engineer when I grow up. —Son, your dream will not e true _____ you keep trying your best.A.whenB.whetherC.unlessD.because【答案】 C 9.—The air pollution is terrible. —It will be worse ______ we take action to protect the environment.A.ifB.unlessC.untilD.when【答案】 B 10.Although she is under great stress, ______ she always wears a smile on her face. A.andB.orC.butD./【答案】 D 11.—Learning to love is like learning to walk. —Yes, ______ we step out bravely, we39。ll find it39。s not so difficult. A.as a resultB.even thoughC.as long asD.as far as【答案】 C 12.Study hard, _______ our parents will be disappointed. A.andB.butC.orD.because【答案】 C 13.__________ the teacher came in, the students stopped reading at once. A.WhenB.WhileC.BeforeD./【答案】 A 14.It is hard to review the knowledge we learn in class ___________ we take notes. A.if160