1. We will_______many advanced countries in encironmental protection,but today we face a wonderful opportunity to address this problem,and we must not let the opportunity_____.

What is opportunity cost and how opportunity comes out?

Good luck is when _____ comes along and you're prepared for it. A: the opportunity B: opportunities C: opportunity D: an opportunity

How does the writer suggest using events such as meetings? A: As an opportunity to relax and have a break. B: As an opportunity to make contacts. C: As an opportunity to listen to experienced people.

17. What opportunity does the contest provide for young people? A good opportunity to ___________________ their creativity.

3 What kind of opportunity does the job ofteaching provide for the speaker? The opportunity to motivate himself to keep on __________.

A ____ opportunity never returns.

What is the opportunity cost?

Opportunity cost of an action is

An opportunity cost is the cost of a(an) ______opportunity A: false B. C. D. B: missed C: absolute D: comparative