Read the passage carefully, then choose the correct answers.
The search for alternative sources of energy has led in various directions. Many communities are burning garbage and other biological waste products to produce electricity- Converting waste products to gases or oil is also an efficient way to dispose of wastes. Experimental work is being done to derive synthetic fuels from coal, oil shale, and coal tars. But to date, that process has proven expensive. Other experiments are underway to harness power with giant windmills. Geothermal power is also being tested. Some experts expect utility companies to revive hydroelectric power derived from streams and rivers. Fifty years ago hydroelectric power provided one third of the electricity used in theUnited States, but to day it supplies only 4 percents. The oceans are another potential source of energy. Scientists are studying ways to convert the energy of ocean currents, tides, and waves to electricity. Experiments are also underway to make use of temperature differences in ocean water to produce energy.
Which of the following is not mentioned in the passage as an alternative source of energy?
A.Burning of garbage
B.Geothermal power
C.Synthetic fuels
D.Electricity

Read the passage carefully, then choose the correct answers.
The search for alternative sources of energy has led in various directions. Many communities are burning garbage and other biological waste products to produce electricity- Converting waste products to gases or oil is also an efficient way to dispose of wastes. Experimental work is being done to derive synthetic fuels from coal, oil shale, and coal tars. But to date, that process has proven expensive. Other experiments are underway to harness power with giant windmills. Geothermal power is also being tested. Some experts expect utility companies to revive hydroelectric power derived from streams and rivers. Fifty years ago hydroelectric power provided one third of the electricity used in theUnited States, but to day it supplies only 4 percents. The oceans are another potential source of energy. Scientists are studying ways to convert the energy of ocean currents, tides, and waves to electricity. Experiments are also underway to make use of temperature differences in ocean water to produce energy.
What provided one third of the electricity in theUnited States fifty years ago?
A.wind
B.waste products
C.water
D.oil

Read the text below and decide which answer best fits each space.
Although they are safe to use in the short term, coal, gas and oil present a long-term (36) ______ to the environment. All three types of fossil fuels produce carbon dioxide in far greater .quantities than plants can use. The carbon dioxide then accumulates in the atmosphere and may even increase the earth's 'heat load' and lead to global (37) _____ in temperature. Furthermore, all three fossil 'fuels are non-renewable forms of energy. Geothermal power is unlikely ever to be an energy source of major importance. It is limited and is exploitable in only a few places. Hydro-power offers a much more useful source of energy. It is also renewable but its (38) ______ is limited. Dams cannot be built in certain areas. In addition, large dams are also capable of causing changes in the world's climate. Wind power is a pollution – free source of renewable energy but it cannot be used in many parts of the world where there is (39) ______ wind. Wave power is better source of energy in certain ways but it is clearly not practicable to build dams across every river estuary or to cover seas with expensive equipment. It is also ineffective where the sea is usually calm. Solar power is renewable, it does not cause pollution and it does not add to the earth's heat load. Unfortunately, solar power is not distributed equally, and in the northern latitudes it is difficult to (40) ______ and store. Solar power' also requires expensive equipment. Finally, nuclear power provides a very efficient and renewable power source. However, not only is there a great danger of leaks or accidents but there is also the problem of the disposal of radioactive waste.
(37)
A.raise
B.change
C.drop
D.rise

Choose word or phrase that needs correcting.
In an essay (A) writing (B) in 1779, Judith Sargeant Murray promoted the cause of (C) women's education.(D)
A.In an essay
B.writing
C.the cause of
D.women's education

Choose word or phrase that needs correcting.
Louisa May Alcott, she (A) best known for her books (B) for children, served (C) as a nurse during (D) the Civil War.
A.she
B.her books
C.served
D.during

Choose word or phrase that needs correcting.
I went to a reunion (A) for students educating (B) in the physics (C) department during (D) the 1980s.
A.reunion
B.educating
C.physics
D.during

Choose the word or phrase that best completes the sentence or substitutes for the underlined word or phrase.
Norman Weiner, ______ mathematician and logician, had an important role in the development of the computer.
A.who as a
B.was a
C.whom a
D.a

Choose the word or phrase that best completes the sentence or substitutes for the underlined word or phrase.
War and Peace, ______, was published in 1869.
A.Leo Tolstoy's most celebrated novel
B.that is Leo Tolstoy's most celebrated novel
C.which most celebrated novel of Leo Tolstoy
D.is a Leo Tolstoy's most celebrated novel

Choose the word or phrase that best completes the sentence or substitutes for the underlined word or phrase.
The Massachusetts State House, ______ in 1798, was the most distinguished building in theUnited States at that time.
A.completing
B.which was completed
C.was completed
D.to be completed

Choose the word or phrase that best completes the sentence or substitutes for the underlined word or phrase.
______ in large quantities in the Middle East, oil became known as black gold because of the large profit it brought.
A.Discovering
B.Which was discovered
C.Discovered
D.That when discovered