根据首字母或汉语提示写出单词

1. The policeman made a polite g_______ at the driver to stop the car.

2. We couldn’t have a picnic because of the s_______ change in the weather.

3. B________ is thicker than water.

4. The children stood _________ (不动)and watched as the deer came closer.

5. It's very _______ (安静的)out here in the woods.

下列叙述逐日平均水位表中水位保证率错误的是（）。

A、以水文年为统计时段

B、以日平均水位作确定值

C、日内瞬时水位高于等于某一水位值的天数

D、某站1999年保证率为90d的水位为1236.50m，就是指该年中有275d的日平均水位小于1236.50m。