Trees not only bring nature to urban areas, but they also help clean the air by absorbing pollutants, ____ oxygen, ____ water, and grow food.
A. providing - saving
B. provide - save
C. to provide - to save
D. to provide - save
Sometimes it’s better not to buy something new, and buy it ____ instead.
A. used
b. useable
c.use
d useful
2.Air pollution is such a serious_____ that it has been a direct factor in the of millions of people each year.
A. threaten - deaths
B. threaten - death
C. threat - death
D. threat - deaths
giups e voi a . E cam on
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Sinh Học lớp 12
