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7. We must..
. the amount of water our family used every day.
A. lower
B.reduce
C.lessen
D. narrow
8. At this time next month we
to Ha Long Bay for a holiday.
A. will go
B. will going
C. will be gone
D. will be going
9. By the middle of the 21t century, people in developing countries.
more renewable energy.
A. uses
B. will be using
C. used
D. have
10. Fossil fuels are very common in our society but they. .. the
environment.
A. renew
B. provide
C. waste
D. pollute