IF HE _______ LATE, WE WILL GO WITHOUT HIM.A. COMES B. CAME C. WIL...
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.