30. If he _______ late, we will go without him.
A. comes B. came C. will come D. would come
V. Read the following passage and choose the best answer for each blank.
Coal is a black solid fossil fuel. It is usually very (31) _______. Coal is made of
65%-95% carbon. It also has hydrocarbons and some other compounds in it. It is (32)
_______ from the remains of plants that lived millions of years ago.
Coal can be burned for energy or (33) _______. About two-thirds of the coal mined
today is burned in power stations to make (34) _______. Burning it is not as common as it
used to be, (35) _______ it causes much pollution.
Natural gas is a mixture. It (36) _______ mainly of hydrocarbons. The main
component is methane. Natural gas is often found in the ground (37) _______ with
petroleum.
Most natural gas is burned (38) _______ to produce energy. It burns with a clean
blue flame. It causes (39) _______ pollution.
The main use of natural gas is to produce electricity. It is also used as (40) _______
for cars, cooking gas and to make fertilizers.
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