My mother doesn’t know __________ this morning.   
#40932
A
what to do
B
what does do
C
how to do
D
why does do
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I didn’t know __________. Can you tell me?
#41111
A
who to speak to
B
who speak to
C
who to speak
D
who spoke
________ climb the mountains(山).
#40972
A
Not
B
Don’t
C
Not do
D
Doesn’t