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A doctor ________(make; makes)sick people better．

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She sells things to people．She is a ________(waiter; shop assistant)

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I usually put out ________(fire; fires)．

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Americans ________(comes, come)from America．

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The workers are burning ________(rubbish, rubbishes)there．

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________(Look, Look at)the dust in the air．

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Where does air pollution ________(is, come)from?

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What's the ________(wrong, matter), Kitty?

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Her bedroom is ________(clean, cleaner)than mine．

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When we have a barbecue, we always cook food with ________(charcoal, electricity)．