根据意思写出单词
noise___ (a sound,usually unpieasant or disturbing)
frightened____ (scared or afraid)
concentrate____ (giving attention to what you are doing)
weep____ (a soft sound or voice)
fail____ (not be successful in doing something)
写出下列各词的反义词
brave( timid) difficult(easy )careful(careless)quick(slow )possible(impossible )rude(polite )comfortable (uncomfortable) danger（safe ）daytime(nighttime)
楼上的回答中,brave的反义词不能是cowardice,因为brave 是形容词而cowardice是名词,同样,quick的反义词不能是slowly因为quick是形容词而slowly是副词.
这种回答中反义词和原词的词性要相同.