The shocking news made me realize______ terrible problems we would face.
A. what
B. how
C. that
D. why
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It was never clear ____ the man hadn't reported the accident sooner.
A. which
B. when
C. why
D. where
It is uncertain_______side effect the medicine will bring about, although about two thousand patients have taken it.
A. that
B. what
C. when
D. why
I'm afraid he's more of a talker than a doer, which is_____ he never finishes anything.
A. that
B. when
C. why
D. what
The little girl who got lost didn’t know ______ she can find her mother.
A. where
B. what
C. that
D. who