根据句意和首字母提示补全单词。

1. You had better brush your t________ twice a day.

2. You can i________  your English if you study hard.

3. The good news s________ very fast. We all know it now.

4. Walking is a good exercise and it is n________ for your health.

5. The classroom is so noisy that we can't hear the teacher c________.

关于工件运送的描述有误的是( )。

A．使用电葫芦调运前，应先进行空运转试验

B．如发现悬挂输送链产生堆链现象，或有过紧、过松及卡壳现象时，需拉紧机构

C．悬挂输送链全线承重要均匀吊挂

D．悬挂输送链的挂重可超载