Peter, a superstar in environment protection, reduces plastic and other _______ through DIY.

The _______ that someday he would succeed cheered him through many disappointments.

It is clear that in modern society high _______ and demands are placed on students. 

—Why don’t you go to medical college and be a doctor?
— Oh. It calls for a great deal of _____with long training, which I am afraid I don’t have.

Climbing Mount Everest          great skills and        not without risk.

There seems to be a __________ that the plan should be given up.

______ came that Prime Minister David Cameron（卡梅伦首相） blamed the worst riots（骚乱）in Britain the other day.

She has changed so much that she is out of our______.

What the science teacher does and says ____ of great importance to college students. 

Dogs are our good friends as they can keep ______ with us when we are lonely．