--- What on earth are the police busy with?--- They have been investigating how the train crash __________. 
#12250
A
came out
B
came across
C
came about
D
came up
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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