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87. It's believed that mixed-ability teaching can _______________(促使他们知识的积累和经历的丰富).
88. We _______________(使我们的行为符合别人的)based on a constant mental process of appraisal and interpretation.
89. The class are very active. They ________________(争先恐后地回答问题).
90. Oxygen is ________________(一种能和许多物质化合的气体).
91. Mr. Smith is ________________(这次事故的目击者之一).
