He spent a large ___ of money on his books.
#7411
A
deal
B
plenty
C
number
D
amount
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She went to the bookstore and bought       .
#7161
A
dozen books
B
dozens books
C
dozen of books
D
dozens of books
He has not enough ______ to walk so far. 
#6194
A
power
B
force
C
strength
D
energy