What is the message to the readers?
A. We should do something to protect our water resources.
B. We should encourage people to use safe water.
C. We should limit the clean water in the world.
D. We should use a lot of clean water.
Chọn đáp án A
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Chinese ______ by more than one billion people all over the world.
In the 18th century, workers liked wearing jean cloth because it was strong and did not ______ easily.
Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correcting in each of the following questions.