根据句意及提示，写出句中所缺的单词。

1．Do you play an _______(积极的) part in the class activities.

2. —Your white blouse _____________(与……相配) your black trousers very well.

—Thank you.

3. My uncle is an    (精力充沛的) businessman. He always works till midnight.

4. He lives a simple life. He likes _____________(储蓄) money.

5. Dr Bethune was busy performing an __________(手术) on the dying man.

安全人机工程学院研究的目的主要是为保障劳动者的安全与健康，对这些不利因素发生的机理和预防措施进行研究，以便创造更（）和更文明的劳动方式和劳动条件。

A．高效

B．快捷

C．灵活

D．安全、卫生