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I am not sure whether I can gain any profit from the investment, so I cant make a ____ promise to help you. A. exact B. defined C. definite D. sure [investment] investment 投资 investigate 调查 irrigate 灌溉 irritable 激怒的 navigate 航行 castigate 惩罚 mitigate 缓和，调解，减轻 [/investment] [sure] sure 确信 insure 保险 ensure 确保 [/sure] define 限定，下定义 final 结束的 refine 提纯 finance 财政，资金 | 
