Be careful not to damage other people's property.

　　小心別損及別人的財物。

　　It would be unfair not to let you have a choice.

　　不讓你有所選擇是不公平的。

　　Be careful not to cross the line.

　　小心別越過(guò)道路的中界線(xiàn)。

　　Be careful not to confuse quantity with quality.

　　注意不要把數量與質(zhì)量混淆了。

　　Be careful not to drop that plate.

　　小心別把盤(pán)子摔了。