【单选题】A heavy commitment to a part-time job during the academic year, say, working 20 hours per week or more, undermines and significantly____________ school achievement and commitment.
【判断题】According to the research in Passage 1, about 20 hours per week is the safe amount of working time that done not affect school performance significantly.
【简答题】A heavy commitmentto a part-time job during the ________ year ( 学年 ), say,working 20 hours per week or more, undermines and significantly interferes withschool achievement and commitment.