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题型：单选题题类：常考题难易度：普通

Never let your mind wander when driving, ______ a car crash is probable.

A、but B、so C、because D、or

举一反三

______ the average age of the population increases, there are more and more old people to care for.

Exactly ______ the potato was introduced into Europe is uncertain, but it was probably around 1565.

There are signs _________ restauraunts are becoming more popular with families.

— Do you know ______ Mr. Black's address is.

— He may live at No.18 or No.19 of Bridge Street. I'm not sure of ______

{#blank#}1{#/blank#} regular exercise is very important, it's never a good idea to exercise too close to bedtime. (状语从句)

Olympic athletes train hard {#blank#}1{#/blank#} they can get good grades at the final competition. (状语从句)

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