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On a world-wide (2) ______ _____, forests help to slow down the effects of global warming by using up the gas known as carbon dioxide and giving (3) ______ the oxygen we need to breathe.

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On a world-wide (2) ______ _____, forests help to slow down the effects of global warming by using up the gas known as carbon dioxide and giving (3) ______ the oxygen we need to breathe.

in

away

up

out

Giải thích

 Đáp án D
 Giải thích: give out (ph.v) tỏa ra (khí)