There's ________ virus going round the office.

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I'm immune ________ smallpox (天花) as a result of vaccination (牛痘).

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I can send him a note ________ the internal mail system.

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Dr Black comes from either Oxford or Cambridge, but I can't remember _________.

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The ship set sail after all the passengers came ________.

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The building must be saved, ________ the cost maybe.

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I didn't hear the phone. I ________ asleep.

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If you don't understand something the examiner says, simply ask for it ________.

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With John ________, we've got more room.

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The order soon came ________ all citizens should evacuate the village.

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