[核 心 单 词]

　　perform vi.表现；性能(如何)vt.履行；执行；演出

　　[经典例句]But those who frequently deal with many things at the same time were found to perform the worst at the actual multitasking test.(2013·北京·阅读理解D)

　　但是那些经常同时处理许多件事的人被发现在实际的多重任务处理测试中表现地最差。

　　(1)perform the role of　　扮演......角色

　　perform a．.. role in　　在......中起......作用

　　perform an operation 进行手术

　　perform one's duty/promise 尽责任/履行承诺

　　(2)performance n. 执行；表演；履行

　　put on/give a performance 表演

　　①Once performed, the works of Beethoven must attract all the people present at the concert.

　　一旦演出，贝多芬的作品一定会吸引所有出席音乐会的人。

　　②As everyone knows, she ____________ in our organization.大家都知道，她在我们的组织中发挥着重要的作用。

　　③Her performance at yesterday's concert was beyond compare.她在昨天音乐会中的表演精彩绝伦。

　　答案　②performs an important role

　　guarantee vt.保证；担保；为......担保n.保证；担保

[经典例句]Consistent, hard work won't guarantee you the level of success you may want, but it will guarantee that you will become really good at whatever it is you