It took us several hours to make the old man ________ of the safety of travelling by air.
#10892
A
believed
B
convinced
C
informed
D
persuaded
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 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