One afternoon my father and I go
fishing on a
56.______________
river side.
We found the water was very dirty that
57.______________
we could
not see the bottom. We also found some
58.______________
rubbish
or dead fish flowing on the water. That 59.______________
afternoon,
my father and I caught only a smaller fish. 60.______________ Why do the fish in the river die? That was
because 61.______________ of a lot of factories along the river always 62.______________ poured its waste water and rubbish into the
river 63.______________
and the
water got polluting(污染)Thus, most of the
64.______________ fish in the river killed.
65.______________