Exercise Twenty-Six
　　1. Man，no less than the lower forms of life，_______________（是演化过程的产物）.
　　2. _______________（不止一个人觉察到）her agitation.
　　3. ________________（液体密度越大），the easier it is to float on it.
　　4. _______________（只有工人的要求得到满足）will they return to work.
　　5. Had ________________（要不是有水库）we'd never have been able to beat the drought.
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