根据句意及首字母提示，完成下列单词拼写。

1. They are waiting for you at the bus s______.

2. Beijing is in the n________ of China.

3. I often get up at h________ past six in the morning.

4. There are sixty m________ in an hour.

5. It's about two k________ from here to there.

悬臂式斗轮堆取料机齿轮会出现那几种故障（）。

A、齿轮轮齿折断；

B、齿轮磨损；

C、键损坏，齿轮在轴上跳动；

D、齿轮有划痕。