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PDF chapter test
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Subjects
Science CBSE
Class 7
Wastewater Story
Textbook questions
2.
Exercises II
Exercise condition:
2
m.
Fill in the blanks:
c
.
Dried
sludge
sledge
slodge
is used as manure
.
d. Drains get blocked by
cooking oil
crude oil
waste oil
and
vitals
fibres
fats
.
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