4、They met while on holiday in Greece.

　　他們是在希臘度假時(shí)認(rèn)識(shí)的。

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

　　我不在時(shí)你要接著干。

　　6、I waited while he gathered up his papers.

　　他整理文件時(shí)我就在一旁等待。

　　7、They palled up while they were at college.

　　他們上大學(xué)時(shí)成了朋友。