根据句意及首字母提示填写单词。

1. Those workers are planting trees a _____ the street.

2. I was l _____ and didn't know how to go back home.

3. People often save their money in the b_____ .

4. Look at the star. It can tell you the direction of the n _____ .

5. I didn't hear you just now. Please read it a _____ .

两个固定的等量异种电荷，在他们连线的垂直平分线上有a、b 、c三点，如图所示，下列说法正确的是

A．a点电势比b点电势高

B．a、b两点场强方向相同，a点场强比b点大

C．a、b、c三点与无穷远电势相等

D．一带电粒子（不计重力），在a点无初速释放，则它将在a、b线上运动