--- How can I get to the island you mentioned?

--- You can't get there ________ by swimming.

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The collapse of the World Trade Centre has put the US economy in a difficult ________.

[　　]

He came to my class every week, but his attitude ________ he was not really interested in the subject.

[　　]

Nuclear science should be developed to guard peace ________ destroy the world.

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--- How far apart do they live?

--- ________ I know, they live in the same neighborhood.

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--- When can I use your computer?

--- Never. ________ should you touch it.

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(2007·上海)

John was dismissed last week because of his ________ attitude towards his job.

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I need to ________ my colleagues about the proposals. Some days later, I will tell you the result.

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Bill is not a fast runner and he doesn't have a chance of winning the marathon, but he will ________ the race even if he finishes last.

[　　]

On account of his knowledge of the mountainous country, John Smith was appointed as our ________.

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