At a beach or a swimming pool a lifeguard is a person who is responsible for __________ other swimmers and protecting them from accidents. 
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A
turning to
B
watching over
C
watching out
D
digging out
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Great changes _______ in our hometown since 1980
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A
took place
B
have happened
C
has been taken place
D
have taken place
It is strongly suggested that measures________factories to pour waste into rivers by the government.
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A
be taken to ban
B
be taken to forbid
C
are taken to ban
D
are taken to forbid