The poor child stood there, and ________ what to do, turned to his father for help.   
#11627
A
not knowing
B
not knew
C
not to know
D
not know
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We hope your suggestion will ______ solving the problem. 
#12009
A
contribute to
B
relate to
C
attend to
D
devote to
 We _____ a word unless she asks us_____.
#12894
A
didn’t dare say; to
B
don’t dare to say; to
C
dared not say; to say
D
dare not to say; to say