[ 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
Random Topics:
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:
Grammar › ViewI’m afraid I can’t meet you tomorrow. ______ lunch with an old friend.
A. I have
B. I will have
C. I’m having
D. I’ve had
Vocabulary › View
The _____ student answered every question correctly.
A. clever
B. pierce
C. rare
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
D. as