一、单项选择（每小题1分，共20分）
从下面各题所给的A、B、C、D四个选项中，选择可以填入空白处的最佳答案。
1. _________ eraser is this? I want to borrow it.
A. Who B. Which C. Whose D. What
2. In order to save the time, we have to hurry up _________.
A. first of all B. from now on C. at first D. at last.
3. Please help the old woman to get _________ the bus.
A. on B. in C. into D. at
