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My baseballs are ________ the floor．
A．in
B．on
C．under
D．at
Is your plant ________ the floor?
[ ]
The basketball is ________ the floor ________ the table．
1Dare’s books are __________the floor．
A．in B．under C．at D．On
－Are the keys in the drawer?
－No, they aren’t．Look, they’re ________ the floor．
in
under
on
behind