ぎゅうにゅうが　くさると　（　　　　）　なります。

A．あまく

B．あかく

C．すっぱく

D．からく

—You look rather tired. _______stop to take a rest？

—All right. But I’ll have to work for a few more minutes.

A．Why not

B．Why don’t

C．What about

D．How about