对于青春，我们充满了好奇。我们可以通过同学间的相互交流，共享成长的体验。交流过程中我们必须遵循的基本准则是[ ]

A．彼此尊重

B．互相取笑

C．故作高深

D．赞同对方的所有观点

--- Look! Lots of  people there. What’s wrong?

--- An old lady was going across the road ________ a car hit her.

A．while

B．as

C．whether

D．when