4、They met while on holiday in Greece.

　　他們是在希臘度假時認識的。

　　5、Carry on with your work while I'm away.

　　我不在時你要接著干。

　　6、I waited while he gathered up his papers.

　　他整理文件時我就在一旁等待。

　　7、They palled up while they were at college.

　　他們上大學(xué)時成了朋友。