[ Subject Verb Agreement ]
One of my best friends __________ an extra on Seinfeld this week.
A. is
B. are
C. do
D. does

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Conjunctions, Interjections and Determiners › ViewDon’t look directly at _____ sun.
A. a
B. an
C. the
Grammar › View
I have sent you a lot of letters but you have never been…………………
A. response
B. respond
C. responsive
D. responsively