(2013·吉林长春三校高三调研)It is important to introduce children to healthy nutritious foods from ________ they begin to eat solids.
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what
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when
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that
D
which
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We can find out ________ all the excitement is about by playing QQ's “Happy Farm”．
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that
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how
C
what
D
when
As a matter of fact, ________ matters most in learning English is enough practice.
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where
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why
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which
D
what
No one knows exactly ______ this important discovery was made.
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that
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that how
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what
D
when
With some technical problems to be solved, it may be a while _______ the system is put into use.
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when
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after
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since
D
before
In America．a friend's inviting you to a restaurant doesn't mean that he or she will pay for the meal you are told in advance．
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unless
B
if
C
although
D
until