A container weighs more after air is put in,_____proves that air has weight. 
#73698
A
as
B
it
C
that
D
which 
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—What’s that building?—       the medical equipment is stored.
#72607
A
There’s in which
B
That’s where
C
The building that
D
That’s the building which
 He fell off the bike ________.
#41254
A
while he rode
B
while he was riding
C
while he is riding
D
while on bike