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