--What can I do for you?-- I’d like to buy a present for my son, _______ at a proper price but of great use.
#15433
A
one
B
the one
C
which
D
that
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  -- _____is that used for?---_____ the floor.
#16278
A
Why; To cleaning
B
What; Cleaning
C
Why; To clean
D
What; clean