Don't smoke in the meeting room, ________?

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I offered them something to eat, ________ they might be hungry.

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He sent me an E-mail, ________ to get further information.

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I will answer her question when ________.

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If I ________ the work, I should do it in a different way.

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I often have conversations with John over ___________ telephone, while keeping in touch with Tom by _________ letter.

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One more word，__________ I'll knock you flat．

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What proof have you got ___________ you are really the lady who should collect this money?

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--How hard the players are practising for the World Cup!

--Hard ___________ they practise，it is hard for them to win the match this time，due to there __________no better skills．

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--Ann certainly has a low opinion of him.

--It can't be any worse than __________ of him．

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