The Math problem is too difficult , we really don’t know ________ to do it .
#37139
A
which
B
where
C
what
D
how
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It was getting dark, but the little boy didn’t know______________.
#37646
A
who can he ask for help
B
what was wrong with the bike
C
where can he go to mend the bike
D
if he could arrive home on time or not
— Could you tell me ____ for the meeting this morning?— Because the traffic was bad.
#38814
A
why did you come late
B
why you came late
C
why do you come late
D
why you come late