His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽)
#78803
A
that
B
how
C
who
D
what
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I ________ think smoking _______ good for you.
#38373
A
don’t; is
B
don’t; are
C
/; aren’t
D
/; isn’t
--- Do you know _____?--- Next Sunday. 
#38985
A
what they will do
B
what will they do
C
when will they come
D
when they will come