集成灶怎么排烟:waste time of doing ?还是waste time to do?

waste time of doing ?还是waste time to do? be taken a waste of time 是固定用法吗？ ____(not waste)time. The advantage and disadvantage of doing a part-time job if you keep doing this "lightning speetd"reading for a period of time if you keep doing this "lightning speetd"reading for a period of time have a hard time doing How do you deal with people who waste time? That is w___ we mustn't waste time. 求关于Don't waste time的英文短文