Mr. Chen has a loud voice. His voice can ______ clearly, even in that big classroom.
#44953
A
be heard
B
hear
C
be hearing
D
have heard
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The earth is our home. It ______________ well.
#44581
A
must be protected
B
should protect
C
need protect
D
need protecting
----Smoking should ____________ in school. ----I agree. It’s bad for our health.
#44526
A
be allowed
B
not allow
C
allow
D
not be allowed