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

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Adverb of Frequency and Past Continuous TenseGerund - to Infinitive Future FormsVerb Tense, Pronouns and AntecedentsVerbs: Will & Going toGrammar-Present Continuous-Sentence MakingModals of Obligation & ProhibitionBe going to / WillPast Continuous and Past Simple TenseModals and Modal PerfectsOther quiz:
Opinion / Agreement › ViewMonika : I was thinking of taking the company on an outing to the mountains.
Ray : I agree, _________
_____
A. I think that would be perfect
B. Can you help me with this stuff
C. I’m sorry to hear that
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If I finish the assignment before Saturday, I………………..(submit) it to my lecturer
A. have submitted
B. can submit
C. submitted
D. had submitted
Grammar › ViewMany birds always _____ south every winter.
A. fly
B. flew
C. are flying
D. will fly
Conjunctions › View
My knee started hurting _____ I stopped running.
A. so
B. yet
C. but
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