People should _____ from throwing the rubbish everywhere .
#44661
A
be stopped
B
stopped
C
stop
D
stopping
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The river smells terrible. People_______ dirty things into it .
#44850
A
must stop to throw
B
must stop from throwing
C
must be stopped to throw
D
must be stopped from throwing
Our classroom   _______   by us every day!
#44538
A
is cleaning
B
has cleaned
C
must clean
D
is cleaned