When deeply absorbed in work, ______ he often was, he would forget all about eating or sleeping.
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that
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which
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where
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when
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The teacher set such a difficult problem ________none of us could solve.
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that
B
so that
C
which
D
as
Thinking of the scenes ________ the people were killed by the invaders, the old man was full of anger.
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when
B
why
C
where
D
which
It’s helpful to put students in a situation _______ they can learn how to cooperate with each other.
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that
B
when
C
where
D
which
The road construction is based on the agreement, one of _______ purposes is to ensure its completion on time.
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which
B
whose
C
that
D
what