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It is important for all of us __________ how to greet others. (know)

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We never visit a friend's house without __________ first. (call)

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The people in that country are pretty ________ about time. (relax)

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All of the students ________ to hand in their homework on time. (suppose)

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The lost key _________ under the tree this morning. (find)

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What kind of volunteer work would you like _________? (do)

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What do you think is _________ invention in the world? (useful)

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A mirror is used for _________ at yourself. (look)

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By the time I got home, I realized I _________ my umbrella in the classroom. (leave)

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She'd like to go somewhere _________. (relax)