The headmaster asked the boy to apologize ______ the teacher _______ what he had done, but he refused to

lastic pollution ______in most public areas, it is hard______.

st have read about Mark Twain long ago, ____

The park is far away from here indeed. It’s about ______ walk.

How do you deal with the disagreement between the company and the customers?— The key _____ the problem is to meet the demand _____ by the customers[ ]