Circle the letter A, B, C, or D to indicate the correct answer to each of the following questions.

Câu hỏi

We should join hands to keep the environment immediately ________.

A. unpolluted

B. polluted

C. contaminated

D. polluting

Đáp án
A. unpolluted

Câu hỏi thuộc Bài tập:

E7- GS- Thi cuối kỳ 2- Test 2