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There is a natural phenomenon      scientists call the greenhouse effect.
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A
that
B
what
C
for which
D
who
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I wish to thank your student Tom, without _______ rescue couldn’t be offered to my drowning boy so soon.
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whose
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Is this school________ I visited last year?
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The American girl       father is an engineer is my pen friend．
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The new buyer identified a dozen new sources for the material, ___________ proved to be reliable．
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B
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C
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D
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This is the only article _____ was written by him.
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A
who
B
whom
C
which
D
that