People are destroying the air by adding ...... to it.

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• After a while, the track we have been following became thick undergrowth.

• Several comet are discovered each year, but very few of them are bright enough to be seen without the aid of magnification

• The number of students attend the class dwindled until only two remained.

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• Had we known the traffic would be so bad, we did not drive back from work so early.

• However types of raw materials are used in making paper, the process is essentially the same.

• Disease is not as widespread than before because of better preventive medicine and vastly improved nutrition.

• Hoover Dam in Nevada is a multi purpose structure that provides flood control, hydroelectric powerful, and drinking and irrigation water

• First raise your right hand, and then, you should repeat after me

• He can speak English, _    ?

• Have you learnt the reason why does the water of the ocean becomes blue?

• The patient who was not supposed to be released until the end of the week was told to dress in clothes and report to the nurses’ station.

• Choose the correct answer to complete the sentence. "Having denied the responsibility for the _____ it caused, the factory was forced to close down"

• All of the mammals, dolphins are undoubtedly among the friendly to human.

• Choose the correct answer to complete the sentence. "Having been _____ about the relationship between climate change and the spread of infectious diseases, everyone should get vaccinated."

• Rice is most important plant in Viet Nam

• The most common form of treatment it is mass inoculation and chlorination of water sources

• It is becoming extremely difficult to grow enough to feed the world’s rapidly increased population.

• He seldom goes to the park, _    ?

• Don't leave here, _    ?

• There is a local elected council which has responsibility for roads street lighting and other facilities