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。D.until【答案】 D 8.—The air pollution is terrible. —It will be worse ______ we take action to protect the environment.A.ifB.unlessC.untilD.when【答案】 B 9.Although she is under great stress, ______ she always wears a smile on her face. A.andB.orC.butD./【答案】 D 10._____________ my brother arrived in Thailand, he visited the local biggest temple at once. A.As soon asB.WhileC.UntilD.Before【答案】 A 11.I don39。t like western food. I seldom eat it ______________ to McDonald39。s with my daughter. A.ifB.whenC.asD.unless【答案】 D 12.The film is really exciting. ______the students ______ their teacher is enjoying the film. A.Both。 andB.Not only。 but alsoC.Either。 orD.Neither。 nor【答案】 B 13.Study hard, _______ our parents will be disappointed. A.andB.butC.orD.because【答案】 C 14.Tom won39。t play puter games __________ he finishes his homework. A.ifB.so that160