[ Vocabulary ]
Carbon dioxide and black carbon, or ______, are two of the most dangerous air pollutants.
A. soot
B. mould
C. mildew
D. asthma
Select your answer:
Random Topics:
Preposition FormTo Infinitive/Bare Infinitive/GerundsNounsTenses PracticeModal AuxiliariesPresent Perfect or Past SimpleTenses UsagePerfect Tenses of VerbsGerund or to InfinitiveOther quiz:
Subordinating Conjunctions › ViewWe cannot go biking _____ we have bikes.
A. even though
B. because
C. although
D. unless
Phrasal Verb › View
W: Hey Sora, he has broke _____ with his girlfriend 😀
S: Finally :)))
A. in
B. on
C. up
D. down