根据括号内的提示翻译下列句子
快点！再过半小时你得把作业交上来。(be supposed to)
                                                                               
如果你觉得学习滑冰有困难，你可以请教Jacky，他是个行家。(ask for one' s advice)
                                                                               
我们班主任出差了。班级由我们英语老师负责。(in the charge of)
                                                                               
既然他充耳不闻，那你就不浪费时间劝他戒烟了。(waste time doing. . . )
                                                                               
他设法找到了一个地方藏他的贵重东西。（介词+which; treasure)