请用尺子在纸上画一条直线。

Please use a ruler to draw a straight ___line on the paper.

孩子们在操场上排成一条直线。

The children formed a straight ___line on the playground.

请不要越过这条线，那边是危险区域。

Please don't cross the ___line, as it's a dangerous area beyond.

电话线路太差，我听不清你说什么。

The ___line is so bad that I can't hear you clearly.

在这件事上，我坚持自己的立场。

On this matter, I stick to my own ___line.