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It is important that every passenger o board _______ before the flight

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Carbon dioxide _______ as one of the main contributors to the greenhouse effect.

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Tourists are advised to take out insurance. Their baggage may go astray

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While Jack was looking through his old albums the other day, he _______ this photograph of his parents’ wedding.

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No one will fly off the _______ for no reason

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Rose must have been sleeping; otherwise, she would have heard the telephone ring

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Without the accident on the way this morning, Rose _______ late for class

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My family gave me a surprising party, _______ was so kind of them