问题补充：
—Mom. May I play computer games just for a while?
— ! Dad is writing his paper.
A. Help yourself
B. It’s up to you
C. Go ahead
D. Behave yourself
答案：
A. Help yourself
B. It’s up to you
C. Go ahead
(答案→)D. Behave yourself
解析： 略考察交际用语. A.请自便 B.由你决定 C. 继续 D. 请规矩一些.规矩题意,妈妈,我可以玩会儿电脑游戏吗?——请规矩点！你爸爸正在写他的论文。故选D。
