---Which of the following sentences is CORRECT?
#37977
A
I don’t know when will he come back tomorrow.
B
I have no idea when will he come back tomorrow.
C
I don’t know when he will come back tomorrow.
D
I have no idea when is he coming back tomorrow.
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Tomorrow is Father’s Day. I don’t know    .
#38504
A
what can I do for my father
B
what I will get for my father
C
where I went with my father
D
where will I go with my father
—Excuse me, could you tell me where _______? —Sure, sir. You can try www.taobao.com. 
#37055
A
can I join in the group-buying
B
did I join in the group-buying
C
I can join in the group-buying
D
I joined in the group-buying