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They try to get some vigorous exercise at least three times ______ week.
A. –
B. a
C. an
D. the

Random Topics:
AdverbTenses and PronounsCorrelative ConjunctionAdverbs (manners & modifiers)Prepositions & Prepositional PhrasesPossessive Pronouns and Adjective PronounsModal Verbs and ConditionalsWould rather/ would prefer/ would likeComparatives - SuperlativesPresent Simple TenseOther quiz:
Vocabulary › Viewto show that you think someone or something is not worth respecting
A. resources
B. scorn
C. establish
Adverb Clauses › View
Identify the subordinate clause in the sentence:
You must do the grammar lesson unless you have already mastered it.
A. unless
B. do
C. mastered
D. lesson
Tenses › ViewMy mom_____ in the market now.
A. was
B. does
C. has been
D. is
Some vs. Any › View
I don’t have __ clean shoes to go to the concert
a. some
b. any
