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I think the biggest problem in banning smoking is ______ people can buy cigarettes easily.
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that
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whether
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where
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how
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We must teach her a good lesson ___ she likes it or not.
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whether
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if
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that
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which
When ______ if he had any idea of what the novel was about, Jack just kept silent.
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asking
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asked
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to ask
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being asked
—Do you remember          he came?—Yes, of course. He came by train.
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that
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when
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where
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how
____ we know now, oceans cover more than 70 percent of the earth.
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That
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Which
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As
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What
In some countries, _____ are called  “public schools” are not owned by the public.
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which
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that
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as
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what