用when, as, while填空:
1.My mother was reading newspaper in the house ________ someone knocked at the door loudly.
2._______ she grew older and older, she became more and more beautiful.
3.My sister was reading a book ________ she was listening to the music.
4.The driver was about to drive away ________ he saw a shoe drop on his car.
5._______ there is life, there is hope.
6._______ she was driving along the road, she saw something huge in front of her.
7.Please let us know ________ you are ready.
8.you trust to the dog, the wolf slips into the sheepfold（羊圈）.
9. the wind blows you must set your sail.
10. We took notes ________ we listened.
 
参考答案:
1.when  当主句是进行时，when有突然意外的意思。
2.As  随着
3.as  一边…一边…
4.when  当…时 主从句同时发生
5.When  此句是谚语when等于if
6.While  表示一个时间段
7.when  表示一个时间点
8.While  表示一个时间段，这是句谚语，意思是不要过分相信别人或依赖别人。
9.As  指从句动作紧跟着主句动作发生，该句是谚语，乘风扬帆，趁热打铁。
10.as  一边…一边…