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10. It was guessed that the fish died
A. since
a powerful toxin in the sea water.
D. because
B. because of
C. as a result
Đáp án của bạn: A
B
D
11. If it rains, we
the match.
A. cancelled
B. cancelling
C. cancel
D. will cancel
Đáp án của bạn: ABC
D
the death of many aquatic
12. Ships spill oil in oceans and rivers. This leads
animals and plants.
A. to
В. in
C. at
D. from
Đáp án của bạn: ABCD
13. Radioactive pollution is increasing
A. because of
the increased use of radioactivity.
B. because
С. as
D. since