MARK THE LETTER A, B, C OR D ON YOUR ANSWER SHEET TO SHOW THE UNDERLI...

Câu 9: Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs

correction in the following question.

Many environmentalists fear that the earth will run out essential natural resources before the

middle of this century.

A. out essential B. before C. environmentalists D. the earth