Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turnharmful gases from the air ______ oxygen for us to breathe.英语学案上的题

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TreestakeinharmfulgasesfromtheairangproduceoxygenforustobreatheTrees_____turnharmfulgasesfromtheair_

Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turnharmful gases from the air ______ oxygen for us to breathe.英语学案上的题
Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turn
harmful gases from the air ______ oxygen for us to breathe.英语学案上的题

Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turnharmful gases from the air ______ oxygen for us to breathe.英语学案上的题
填into.