`1. ->` Yes, they are.
`2. ->` There is too much smoke in the air in many cities in the would.
`3. ->` We are cutting down many trees, burning the forests, destroying lots of plants and animals.
`4. ->` No, they can't.
`5. ->` The Earth is in danger now.
`6. ->` We must save the Earth right now !
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#Học tốt ^^
