The volume of traffic in many cities in the world today continues to expand. This

Câu hỏi :

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks.

A. about 

B. for 

C. of 

D. by

* Đáp án

* Hướng dẫn giải

Đáp án : C

Risk of st: nguy hiểm, hiểm họa

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