The time is not far away _____ modern communications will become widespread in China's vast countryside.
[     ]
A. when
B. as
C. until
D. before
— The MP3 cost me about 2,000 yuan. 
— Well, it was crazy of you to spend so much money _____ you could buy a cheaper one.
[     ]
A. when
B. unless
C. if
D. because
_____ everybody knows about it, I don't want to talk any more.
[     ]
A. For
B. Even
C. Since
D. However
— How long do you think it will be _____ the Stock Market returns to normal?
— At least one year, I guess.
[     ]
A. when
B. before
C. until
D. that

— Our journey cost a lot of money.
— Really? Well, that doesn't matter _____ you enjoyed yourselves.

[     ]
A. as far as
B. unless
C. as long as
D. in case
Let's put off the picnic until next week _____ the weather may be better.
[     ]
A. since
B. if
C. as
D. when
Perhaps the day will come _____ people will be able to breathe clean air in cities.
[     ]
A. when
B. while
C. as
D. since
— How long do you think it is _____ he took up the job? 
— Half a year at least.
[     ]
A. when
B. before
C. that
D. since
Double ovens are a good idea, especially _____ you are cooking several meals at a time.
[     ]
A. though
B. if
C. that
D. unless
— How long have you ______ this book?
— _____ 1994.
[     ]
A. had; Since
B. bought; Since
C. borrow; In
D. kept; In
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