—I wonder         if I park my car here.

—Of course it does. You need to find a safer place.

最后完成“扫六合”的是哪个诸侯国？这个诸侯国能够“扫六合”的最主要的原因是什么？

设向量$\overrightarrow{a}=(1,-1)$$\overrightarrow{b}=(0,1)$，则下列结论中正确的是(   )

Today, WeChat（微信）becomes very popular, and more and more people like to use it to      each other.   

关于温度、热量、内能，以下说法正确的是（  ）