PDF chapter test TRY NOW
Fill in the blanks.
(a). Burning of wood and coal causes of air.
(b). A liquid fuel, used in homes is .
(c). Fuel must be heated to its before it starts burning.
(d). Fire produced by oil cannot be controlled by .
Answer variants:
global warming
chemicals
propane
water
ignition temperature
LPG
air
pollution
acid rain
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