Look at the notice. You are not allowed _____ the gymnasium without permission. [ ]

A. to enter

B. enter

C. for entering

D. entering

Ⅰ级防水屋面宜采用( )。

A．再生橡胶改性防水涂料

B．环氧树脂防水涂料

C．SBS橡胶改性沥青防水涂料

D．聚氯乙烯改性沥青防水涂料