dunce|dunces

别像个傻瓜一样站在那里傻笑。

Don't stand there grinning like a ___dunce.

班上的几个差生总是跟不上课程进度。

A few ___dunces in the class always fall behind the lessons.

别像个傻瓜似的把钥匙锁在车里！

Don't be a ___dunce and lock your keys in the car!