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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:
Random Topics:
Correlative conjunctionsGrammar of Conjunctions and PrepotitionsAdverbial Clauses of Reason / CauseSimple Past Tense and Past Perfect TensePossessive AdjectivesWish, Unless, If sentencePresent Perfect and Present Perfect Progressive TensesWill or Going toVocab and GrammarTenses of VerbsOther quiz:
Grammar › ViewRoni has …. for two hours
A. slept
B. sleeped
C. sleep
D. sleeps
Mixed General Quiz › View
Do not ___ to me.
a. lie
b. lye