--What terrible water!

-- Er,      things are getting better. Our government is trying its best.

A．in fact

B．for example

C．instead of

D．at first

建筑外门窗的安装必须牢固，在砌体上安装门窗严禁用（）固定。

A.钻孔

B.射钉

C.铆接

D.预埋件