homework. 1...teaches isn't likely to think much of the students who cann't think for themselves. 2...when he was in high school ,hardly anyone did science research ,more less accepted the training of that. 3...envy is the result of laziness and innocence. 4...some students choose their volunteer job according to their major rather than doing something what they meet . 5...the best way is breaking up the students into several groups and letting them focus on abstract question to talk about.