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1. When I walked past his house，________________(我听见他在弹钢琴).
2. ________________(学生们应该从这里得出一条经验)：Don't be misled by false appearances.
3. Had ________________(要不是有水库)we'd never have been able to beat the drought.
4. Man，no less than the lower forms of life，_______________(是演化过程的产物).
5. ________________(液体密度越大)，the easier it is to float on it.
