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My mother is a teacher ________(when, while)my father is a doctor．

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An accident happened ________(when, while)the plane arrived at the airport．

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We may go to Beijing by train ________(and, but, or)by plane．

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It's fine now．________(and, but, or)the weather report says it will rain later．

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Lucy is a careful girl ________(and, but, or)she studies hard．

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He didn't come home early ________(because, because of, so)he helped a lost boy．

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This is the first time for him to speak at the meeting ________(because, because of, so) he feels very excited．

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We moved to another city ________(because of, because, so)too much noise here．

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They ________(hope, wish)they could visit to moon someday．

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I ________(hope, wish)my classmates to pass the exam successfully．