your pets inside as much as you can when the weather is bad.

A．Keep

B．Keeping

C．Kept

D．To keep

具有自重轻、耐火性好的优点且安装简易的型钢是( )。

A．热轧型钢
B．冷弯薄壁型钢
C．轻钢龙骨
D．压型钢板