I. Choose the word that best completes each sentence.

1. Be careful when you _____ the street.

A. over B. along C. across D. throughout

2. The lights had gone out _____ we had to light up the candles.

A. and B. so C. but D. then

3. Tom’s bag is in the library. He _____ it here yesterday afternoon.

A. must have left B. should have left
C. must be leaving D. needn’t leave

4. Workers in this factory often work late. They work on Sundays sometimes, _____.

A. as well B. in addition C. but also D. though

5. He _____ be sick. I saw him playing basketball in the schoolyard yesterday.

A. needn’t B. shouldn’t C. can’t D. mustn’t

6. A / an _____ species is a population of an organism which is at risk of becoming extinct.

A. danger B. dangerous C. endanger D. endangered

7. Governments have _____ laws to protect wildlife from overhunting.

A. enforced B. enacted C. observed D. required

8. You’d better _____ those glasses carefully if you want them to arrive intact.

A. pack B. to pack C. packing D. have packed

9. You _____ take the raincoat along with you today. It _____ rain this afternoon.

A. ought to/ mustn’t B. needn’t/ will
C. will/ must D. should/ might

10. Choose the sentence that has the same meaning as the given one.

 – “You should have finished the report by now,” the boss said to his secretary.

A. The boss reminded his secretary of finishing the report on time. B. The boss advised his secretary to finish the report on time.
C. The boss scolded his secretary for not finishing the report on time. D. The boss suggested his secretary should have finished the report.

II. Read the passage carefully and choose the best answers.

     We live in a dynamic world, and habitats are always undergoing changes at all sorts of levels. However, natural changes usually occur at a slow pace so that impacts on individual species tend to be slight – at least in the short term. When the pace of change is greatly accelerated, there may be no time for individual species to react to new circumstances, and the effects can be disastrous. Briefly, this is the reason that rapid habitat loss is regarded as the chief cause of species endangerment, and there is no force more powerful in this regard than human beings.

To some extent, every part of the earth has been affected by human activities, especially during this past century. This applies on virtually every scale, from the loss of microbes in soils that once supported tropical forests, to the extinction of fish and other aquatic species in polluted freshwater habitats, to changes in global climate caused by the release of greenhouse gases.

     From the perspective of an individual human lifetime, such changes may be hard to detect and their effects on individual species may be hard to predict. But the lesson is clear enough. For example, although many countries have had plans to grow many tropical forests, they are highly susceptible to destruction because the soils in which they grow are poor in available nutrients. Centuries may be required to bring back a forest that was cut down or burnt out in the space of a few years. Many of the world’s severely threatened animals and plants live in such forests, and it is certain that huge numbers of them will disappear if present rates of forest loss continue.

1. Habitats in the world are unchangeable and fixedly exist.

A. True B. False C. No information

2. All species can adapt themselves to new circumstances easily and quickly.

A. True B. False C. No information

3. Human beings are the main cause that leads to rapid habitat loss.

A. True B. False C. No information

4. Many kinds of fish are also in danger of extinction because water habitats are polluted.

A. True B. False C. No information

5. Many countries have grown as many tropical forests as they destroyed in the past years.

A. True B. False C. No information

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