It’s the sort of work that ____ a high level of concentration. [ ]

下列句子与例句句式相同的一项是（ ）例：折节读书，欲以此驰骋当世，然终不遇。

(2013·山东青岛2月质检)________ you need something, please don’t hesitate to let me know

They will not go to the concert if it tomorrow.

How many _______do you have–Let me see, my father has two brothers.