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Children of this age should be reminded of________ to do in public places.
#30654
A
what
B
whether
C
how
D
why
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Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
#32683
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before
B
when
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since
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until
  _____ he stayed in England , he visited some of his friends.
#34594
A
When
B
During
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I believed, though I could be mistaken,______ he liked me.
#80484
A
that
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what
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which
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 Everything was placed exactly ________ it used to be before she left the laboratory.
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why
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when
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This summer North China was attacked by such a terrible heat             few people has ever experienced before.
#30617
A
that
B
and it was
C
which
D
as