Dưới đây là các từ đã được chia dạng đúng để hoàn thiện câu:

1. The students are practising their presentation on (environment) **environmental** protection.
2. More and more people begin to adopt a greener and more (sustain) **sustainable** lifestyle.
3. It is usually caused by the (emit) **emission** of particulates or nitrogen dioxide.
4. We are conducting a survey of consumer attitudes towards (organ) **organic** food.
5. The natural environment has been (serious) **seriously** destroyed by human activities.

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