There         a lot of _______. in the park. 
#43958
A
is, child
B
are , childs
C
are, children
D
is , children
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______ the students who took part in the training is 450.
#85838
A
A number of
B
A lot of
C
Lots of
D
The number of
Large quantities of water ______and lots of fish died.
#86256
A
has been polluted
B
were polluted
C
is polluted
D
was polluted