[填空题]We must work together to protect the environment and there is a great deal that we can do together.

[填空题]We must finish the work on time.
The work must ______ on time.

[单项选择]I must work hard, however I’ll fail in the exam.
A. must
B. hard
C. however
D. in

[单项选择]—Must we finish the work today
—No, you ______.
A. mustn’t B. can’t C. needn’t

[填空题]How many steps must we take when we read a map
We have to take （）.

[单项选择]We must manage to do our work better with ______ people.
A. less money and few
B. less money and fewer
C. little money and less
D. few money and less

[单项选择]when must they work out the problems
A. Tomorrow.
B. Now.
C. Next week.

[单项选择]When must they work out the problems
A. Tomorrow.
B. Now.
C. Next week.

[填空题]

How many steps must we take when we read a map We have to take ______.

[填空题]What kind of work must the managers assure
Work must be done in the （） and （） way.

[单项选择]We must do whatever we can to free some parts of the country from poverty.
A. 我们必须做任何事情，我们就可以使贫困的国家部分免费。
B. 我们必须竭尽所能，使贫困的国家部分免费。
C. 我们必须竭尽所能消除国内某些地区的贫困。 D. 我们必须竭尽所能使贫困国家的部分地区脱贫。

[单项选择]We must make sure we get to the station（），because we’ve still got to buy our tickets.
A. on time
B. in good time
C. for a time
D. at one time

[填空题]We should do all we can to protect wetlands to ensure that their functions and values will be preserved for______.

[单项选择]When must they work out the problems
[A] Tomorrow. [B] Now. [C] Next week.

[单项选择]when must they work out the problems
[A]Tomorrow. [B]Now. [C]Next week.

[填空题]When we compare men with animals, we must remember that a man is also an animal. But in making this comparison, it is sometimes more convenient to refer to the rest of the animal kingdom as "animals".
(1) .
Many animals are intelligent in the sense that they can explore their surroundings or acquire new skills by learning from their parents. Animal organisms have organs whose physical power exceeds the power of men. The bodies of men have no wings and cannot fly. Men cannot imitate fish and spend long periods under water unless they carry breathing apparatus with them.
(2) . But it is very uncommon for animals to go mad or destroy their own kind. Animals, left to themselves, do not disturb the balance of nature. They do not turn grassland into desert or make water undrinkable by filling whole lakes and rivers with waste materials. Compared with most other organisms—if we see him as a part of nature—man is wasteful and destructive. Though he is more intell