1、Many buses go to the beach.It is difficult to decide ___which to take_____(不知道该选择哪辆车).
2、The tour leader will tell the tourists_____where to put______their bags and ____when to get up______for breakfast.（导游会告诉游客把包放在哪里,什么时候起床吃饭）
3、The students are discussing ____who to choose_____ as their class monitor（讨论选谁当班长）.
4、It is important for a good speaker to know _____what to talk about______ and _____hwo to use_____ body language.(好的演讲者要知道该说什么,如何运用身体语言)