There is a peaceful and calm _____ in the country, quite different from that of a big city. 

In this experiment, the famous professor showed three different____ to the study of physics．

These tables and desks are all made of＿＿＿＿＿．

When we ___ a foreign language, we’d respect its ____, or we can’t really learn it well.

I’m told that you are going to Canada to have a three month further study. Don’t let such a good chance to improve your English _____ through your fingers.