C
1970 was World Conservation（自然保护）Year. The United Nations wanted everyone to know that the world is in danger. They hoped that people would act quickly in order to conserve nature（大自然）. Here is one example of the problem. At one time there were 1,300 different plants, trees and flowers in Holland, but now only 866 remain. The others have been destroyed by modern man. It is said that there are tens of thousands of kinds of animals in the world, but now many have died out（绝种）. We are changing the earth, the air and water, and everything that grows and lives . We can't live without these things. If we continue like this, we shall destroy ourselves.
What will happen in the future？Perhaps it is more important to ask“What must we do now？”The people who will be living in the world of tomorrow are the young of today. A lot of them know that conservation is necessary. Many are helping to save our world. They plant trees, build bridges across rivers and so on. In a small town in the United States a large group of girls cleaned the banks of  11 kilometres of their river. Young people may hear about conservation through a record called“No one's going to change our world.”It was made by the Beatles, Cliff Richard and other singers. The money from it will help to conserve wild animals.
65、“No one's going to change our world”was 　　　.
A、an important book published in 1970    
B、an idea that nobody would accept（接受）
C、a record calling on people to conserve nature
D、a newspaper report in 1970
66、What's the most important thing for us to do to save our world？
A、We should know what will happen in the future.
B、We should plant more trees and flowers.
C、We should clean the banks of our rivers.
D、We must do what we must do to save our world.
67、What's the main idea of the passage？
A、1970 was World Conservation Year.
B、The United Nations wanted everyone to know that the world is in danger.
C、Conservation is necessary.
D、Young people are helping to save our world.

To keep ______, we must do more out-of-door exercises.

　　A. well　　B. fine　　C. fit　　D. health ‘

It is required that we _________ what teachers require 　　　 us in class.

　 A. will do, of　　 B. must do, from　　 C. do, of　　　　 D. should do, for

We must do our best to help the ones who are in trouble.

We must do _____　 _____ _______ to help ________ in trouble.