_________(56)
A.in
B.for
C.at
D.on
_________(57)A.like B.forC.at D.into
_________(54)A.by B.forC.at D.in
_________(54)A.To B.ForC.At D.On
_________(56)A.mnuse B.for useC.byuse D.on use
_________(55)A.in B.at C.for D.on