根据下列句子及所给单词的首字母写出所缺单词。(每空限填一词)
【小题1】David, be a b_________ boy. Don't be afraid of fighting against the bad people.
【小题2】They d_________ the facts of the news. They are not very sure of it.
【小题3】The driver was lying! He didn't tell the t_________ of the traffic accident.
【小题4】The boy is trying to s___________ this difficult problem by himself.
【小题5】Terry gave a c_________ answer, so the teacher was quite happy.
【小题6】I knock the door. There s_________ to be no one at home.