[ 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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Intermediate Prepositions › ViewDo you have a free access ___ this site?
A. at
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The anti- smoking campaign had quite an impact _____________the young.
A. On
B. In
C. By