Topics: Verb Tenses
Carbon dioxide may be absorbed by trees or water bodies, or it may stay in the atmosphere when_________________, while it is only in the atmosphere that chlorofluorocarbons find their home.
A. by releasing emissions from cars
B. cars that release emissions
C. released from car emissions
D. emissions are released from car
Select your answer:

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A. HAS A COLD
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Vocabulary › View
What is a quill?
A. A hard hollow tube from an animal
B. A cutting and chopping tool
C. Dry material to light a fire
D. Branches of a tree
