The money collected should be made good use ________ the people in Sichuan Province who suffered a lot in the earthquake.

—How was your trip?—Fine but ______．Milan was interesting．It’ s bigger than I expected, however a little ______ and dirtier．

Certainly I posted your letter---I remember ____it.

When _______ help, one often says “Thank you” or “It’s kind of you”.  　 

The teaher told his student ___ any noise in class.