The world _____ . Things never stay the same.
#38620
A
changes
B
is changing
C
was changing
D
will change
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If we __________ careful,fire can be dangerous。
#41667
A
don’t be
B
are
C
aren’t
D
won’t be
--Is Mary in the classroom? -- No. She______ to the library. 
#38305
A
goes
B
had gone
C
has gone
D
would go