[ Preposition & Gerund ]
Brian really has to work _______ improving his vocabulary.
A. in
B. at
C. on
D. for
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Coordinating Conjunctions › ViewHe is allergic to peanuts, _____ he loves peanut butter sandwiches.
A. yet
B. however
C. and
D. because
Vocabulary › View
Exacerbate
A. Complicate; make worse
B. Deflate; let down
C. Eat