1) What is a light bulb? a) b) c) 2) Which is a synonym of "rise" a) decrease b) increase c) steady 3) What is "sink"? a) b) 4) What word is more related to "struggle"? a) effortless b) easy c) difficult 5) Coal is a ________ source a) renewable b) non-renewable 6) Which is a biofuel? a) natural gas b) gasoline c) ethanol

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