They were lost at________ sea，________the mercy of the winds and the Waves．

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It is useless your ________him．

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I can lend you the money________ you give it back at the end of three weeks．

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When he entered the teacher's office，he found the teacher________ at the desk，doing his work carefully．

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You have been late for two hours，otherwise，We________ the whole design．

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Sometimes it was a bit boring to work there because there wasn't always ________much to do．

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I work in a business________ almost everyone is waiting for a great chance．

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Playing tricks on others is________ we should never do．

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There was ________time ________I hated to go to school．

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What surprised me was not what he said but________ he said it．

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