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_____ is an adjective to describe something is both highly destructive and not easy to detect and of course causing harm

• Pursue

• Pernicious

• Innocuous

Erosion of America's farmland by wind and water has been a problem since settlers first put the prairies and grasslands under the plow in the nineteenth century. By the 1930s, more than 282 million acres of farmland were damaged by erosion. After 40 years of conservation efforts, soil erosion has accelerated due to new demands placed on the land by heavy crop production. In the years ahead, soil erosion and the pollution problems it causes are likely to replace petroleum scarcity as the nation's most critical natural resource problem.

Q: It is pointed out in the reading that in America ----.

• petroleum is causing heavy soil erosion and pollution problems

• heavy crop production is necessary to meet the demands and to prevent a disaster

• soil erosion has been hastened due to the overuse of farming lands

• water is undoubtedly the largest cause of erosion

• there are many ways to reduce erosion

indicate, signify directly, refer to specifically

• reinforce

• perceive

• denote

____ beside his damaged vehicle

• The motorist in the middle of the road lying

• Lay in the middle of the road the motorist

• In the middle of the road lay the motorist

• In the road the motorist lay in the middle

• In the road in the middle the motorist lay

Active ===> passive

The children can read books.

Books (a)   by the children.

Fill in the correct passive form of the verb.

When we first met, I (a)   a job at the bank. (ALREADY OFFER)

Fill in the correct passive form of the verb.

No letters (a)   since the start of strike. (DELIVER)

Some people are very competitive and hate to_______ a game or competition.

• loose

• lose

• lost

indicate, signify directly, refer to specifically

• reinforce

• perceive

• denote

Profits fell _____ 10%, from 2,000 to 1,800 in 1970.

• to

• at

• by

• of