There were dirty marks on her trousers _______ she had wiped her hands.
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A
where
B
which
C
when
D
that
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What have you got _________ will help a cold?
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A
what
B
that
C
it
D
who
_____his father had come, his face lit up.
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A
Having learned
B
When he learned
C
Heating
D
When learning
 There were two boys in the lab,       did the experiment successfully.
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A
the clever of whom
B
the cleverer or whom
C
the clever of them
D
the more clever of them