单项选择题
The day before the evening party，the students were busy（）for the stage.
A.making preparationsB.on preparingC.doing preparationsD.to be prepared
单项选择题 In order to get rid of the habit of smoking，you must set a date（）you are going to stop.
单项选择题 I think the idea which they have given（）pretty good in fact.
单项选择题 Although tigers are（）to people, they are（） now and we should protect them or they will die out.
