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Fill in the blanks spaces using the answers provided. carbon ii Oxide, ventilated, crude oil, animal waste, insulated, sun.
1. Solar energy is derived from the
.
2. Houses should be
to prevent loss of heat.
3. Biogas production depends mainly on availability of
.
4. Paraffin and gas are products of
.
5. Charcoal should be used in a well
room.
6.
is a poisonous gas produced when charcoal burns.
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