单项选择题

When travelling, you are advised to take travellers' checks, which provide a secure ______ to carrying your money in cash.

A. substitute
B. selection
C. preference
D. alternative
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I don't know you want to keep the letter. I've ______ it up.
A. torn
B. given
C. broken
D. disposed
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We can ______ the two islands with a bridge.
A. unite
B. connect
C. relate
D. combine
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