Grammar Quiz

[ 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:
A  B  C  D  E 


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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 Perfects

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Many birds always _____ south every winter.

A. fly

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My knee started hurting _____ I stopped running.

A. so

B. yet

C. but

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