习题：

　　1.__________________ （直到失去健康） that people know the value of health.
　　2.The bag was stuffed____________________（脏衣服）.
　　3.___________________ （很多朋友不在）, we decided to put the meeting off.
　　4._______________________ （给我印象最深的） were her liveliness and sense of humor.
　　5.There engines are___________________ （不如我们制造的那些发动机功率大） .
　　

　　答案：
　　1.It is not until they lose it
　　2.with dirty clothes
　　3.With many friends absent
　　4.What impressed me the most
　　5.less powerful than the ones we have made