Excuse me, Mr Brown, is this ______ umbrella
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The teacher wants you to return that book of ______ that he lent you.
Mary was ______ in the exam.
A. a first
B. first
C. the first
D. one
All ______ worries him is his father"s objection to it.
either, neither, no one, none I don"t agree to ______ of the two proposals.