14.If everybody_____solar energy, there will be much less pollution.
A.will use
B.had used
C.uses
D.use
15.About 20 percent of the world’s population speaks English as_______ first or second language.
A.a
B.an
C.х
D.the
16.Debris from collapsed building was______ across the whole area.
A.hit
B.scattered
C.struck
D.damaged
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