常用的耐火材料有耐火砌体材料、耐火水泥和（）。

A．耐火混凝土

B．耐火石棉

C．玻璃纤维

D．蛭石

We suddenly saw the bus about to leave and had to run _____ to catch it.

A．hardly

B．awkwardly

C．hard

D．strongly