1) throwing Garbage a) MUST b) MUSTN'T 2) Trash from factories a) MUST b) MUSTN'T 3) Pesticides and fertilizers a) MUST b) MUSTN'T 4) Recycle and reuse a) MUST b) MUSTN'T 5) Pick up trash a) MUST b) MUSTN'T 6) Plant trees a) MUST b) MUSTN'T

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