—Do you have any problems if you ______ five minutes to read?

—Well, I’m thinking about the new words. There are too many.

A．give

B．are given

C．will be given

D．gave

往如图所示的烧杯中加入一种物质，轻轻搅拌后，粘在烧杯底部的塑料片脱落，加入的物质不可能是（　　）

A．氢氧化钠

B．氯化钠

C．氧化钙

D．浓硫酸