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.