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One of _______ most serious environmental problems is _______ pollution.
A. the,zero
B. a,the
C. an,the
D. zero
Select your answer:
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Modals and Present TensesModals "Should"Take or PutNoun / PronounPresent Progressive or Present SimplePast Continuous and Past Simple TenseVocabulary : Coming & GoingProgessive TensesThird Grade ExamNounsOther quiz:
Grammar › ViewDid you take________photos in the zoo?
A. any
B. much
C. a little
D. a few
General › View
Which continent is the largest?
A. Asia
B. Europe
C. Africa
D. South America