青岛“天价大虾”事件（如图5）经网络曝光，便引起轩然大波，各种词侃的段子纷至沓来，青岛市的形象遭到严重破坏。对这一事件认识正确的是 （   ）

①市场调节失灵的具体体现

②企业要建立和完善社会信用体系

③国家需要加强市场的监管

④消费者可采取任何手段维护权益

根据所给提示，完成句子。每空一词，含缩略词。
There was a football match on TV last night.(变为一般疑问句）
____ a football match on TV last night ?
He’s been in China since ten years ago.(变为否定句）
He  ____ in China since ten years ago.
Tom got up early in order to catch the first bus to Chongqing.(同义句）
Tom got up early ____  he could catch the first bus to Chongqing.
Steve will finish his book in a month. (对划线部分提问）
____ will Steve finish his book?
____ 邮件英语是一种为了节约时间而正在被使用的书面语。（完成句子)
E-mail English is a kind of _______   English which is being used to  ______  time.

分解因式：$x^2-2xy+y^2+x-y$=____

2015•贵州遵义）I am old enough to wash _     clothes by myself. You can just wash     _.