A.falls/in
B.has been falling/on
C.has fallen/at
D.is falling/in
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A.foam or soda acid
B.dry chemical or foam
C.carbon dioxide or dry chemical
D.carbon dioxide or foam
A.pass
B.overtake
C.catch up
D.run down
A.course
B.track
C.direction
D.trend
A.the apparatus
B.equipment
C.riggings
D.fittings
A.is
B.has
C.are
D.have
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