响应: to respond to, answer...
冒充: to feign, to pretend to be, to pass oneself off as...
随时: at any time, at all times, at the right time...
经验: experience, to experience...
担忧: to worry, to be concerned...
旷课: to play truant, to cut classes...
完善: (of systems, facilities etc) comprehensive, well-developed, excellent, to refine, to improve...
散布: to disseminate...
糟糕: too bad, how terrible, what bad luck, terrible, bad...
摸索: to feel about, to grope about, to fumble, to do things slowly...
