1. Complete the sentences using the correct forms of the words in the box.
(Hoàn thành câu sử dụng dạng đúng của từ trong hộp.)
heat-trapping
1. Solid
2. Burning.
3. When trees are cut down or burnt, they
4. Many people are not aware that
5. One of our goals is to reduce global CO2
6. ...
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