___ knows the way to the hospital so we have to ask the policeman for help.
---I saw Li Ming standing in the teachers’ office. ---Really? He _______ basketball with other boys on the playground just now.
--- Would you like _____ camp with me? --- I’d like to. But I am busy ______ my homework.
--- Lin Tao, can I use your English dictionary? --- Sure. But you _______ return it before the class.
--- What do you think of pollution of the big factory? --- It’s a serious problem. We should _____ all the people to do something for it.
There is little water in your cup, ________?