Trong các hành vi sau, hành vi nào gây ô nhiễm môi trường? Vì sao? a) Khai thác thủy, hải sản bằng thuốc nổ. b) Khai thác gỗ theo chu kì, kết hợp cải tạo rừng. c) Phá rừng để trồng cây lương thực.

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IV. Rewrite the sentence using modal verbs in passive. 1. Ann can't use her office at the moment. ≥............................................................................................................................................ 2. I have to finish my work now. ≥............................................................................................................................................ 3. You must do your task. ≥............................................................................................................................................ 4. Governments should offer poor women more help. ≥............................................................................................................................................ 5. We must do something before it's too late. ≥............................................................................................................................................ 6. My uncle may earn 500$ a day. ≥............................................................................................................................................ 7. He might have caught the fish. ≥............................................................................................................................................ 8. They will sue the company for wage discrimination. 3 ≥............................................................................................................................................ 9. She could have washed the dress. ≥............................................................................................................................................ 10. She can't pick many flowers. ≥............................................................................................................................................