屋面卷材防水层上有重物覆盖或基层变形较大时，卷材铺贴应优先采用有铺贴方法有()。

A.空铺法 

B.点粘法 

C.条粘法 

D.冷粘法 

E.机械固定法

I had to ______ because someone else wanted to use the phone.

A．give up

B．put up

C．hang up

D．ring up