[ Vocabulary & Grammar ]
My mother buys blueberries very often, and she thinks the ____________ they contain can improve our eyesight.
A. products
B. substances
C. convenience
D. environment

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Articles with SubstancesQuantifiers / Prepositions of Time and Comparative AdjectivesPast Perfect Simple & Past Perfect ContinuousSo Such Enough TooPaired ConjunctionSimple Present and Present Continuous TensesIf Conditional Zero and OneModals and InversionGrammar Error Correction (Simple Present Tense)Indefinite ArticleOther quiz:
Present Perfect Tense › ViewI have ______________________ done the shopping.
A. Already
B. Ever
C. Yet
D. Since
Grammar › View
The article ___ is used only before a consonant sounds.
A. the
B. an
C. does
D. a
Intermediate Prepositions › ViewDo you have a free access ___ this site?
A. at
B. to
C. for
D. of
Prepositions › View
The anti- smoking campaign had quite an impact _____________the young.
A. On
B. In
C. By