(2013·高考山东卷)Mark needs to learn Chinese ________ his company is opening a branch in Beijing.
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A
unless
B
until
C
although
D
since
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The time is not far away ________ modern communications will become widespread in China’s vast countryside.
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A
as
B
when
C
until
D
before
Mary liked to look back on her high—school days， she thought were the happiest in her life．
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A
that
B
what
C
which
D
when
On returning from work, _____.
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A
John found a letter in the mailbox
B
a letter was found in the mailbox
C
a letter was in the mailbox
D
the mailbox had a letter in it
Occasions are quite rare ____I have the time to spend a day with my kids.
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A
who
B
which
C
why
D
when
_______ in the regulations that you shouldn't tell other people the password of your e-mail account.
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A
What is required
B
What requires
C
It is required
D
It requires