8. ________ the project in time, the staff were working at weekends.
A. Competing            B. Having completed  C. To have completed D. To complete
【解析】D。不定式用于句首表示目的（即用作目的状语）。又如：To avoid any delay please phone your order direct. 为免延误，请直接打电话预订。To gratify my curiosity, do tell me what it is. 为满足我的好奇心, 你一定得告诉我那是什么。
9. ________, you need to give all you have and try your best.
A. Being a winner      B. To be a winner     C. Be a winner          D. Having been a winner
【解析】B。不定式用于句首表示目的（即用作目的状语）。句意为：要想获胜，你必面要倾其所有，全力以赴。
10. The children all turned ________the famous actress as she entered the classroom.
A. looked at              B. to look at              C. to looking at         D. look at
【解析】B。考查不定式用作目的状语的用法——“转头”的目的是“为了看……”。句意为：当这位著名的女演员走进教室的时候，孩子们都转过头来看她。
11. Schools across China are expected to hire 50,000 college graduates this year as short-term teachers, almost three times the number hired last year, ________ reduce unemployment pressures.
A. help                     B. to have helped       C. to help                 D. having helped
【解析】C。考查不定式用作目的状语，to help reduce unemployment pressures的意思是“为了减轻失业压力”。全句意为：为了减轻失业压力，中国的学校今年有望聘用50,000大学毕业生作为短期教师，差不多是去年聘用学生人数的三倍。