根据中文意思,完成下列各句。
1. 如果有二百万美金,你会做什么?
What would you do if you _____?
2. 这个组织投入一百万元进行医学研究。
The organization gave one million yuan to _____.
3. 我昨天在大街上散步时偶然碰上一位老朋友。
I_____ an old friend _____ while l was walking in the street yesterday.
4. 睡前散散步有助于放松。
_____ _____ before _____ to bed can help you _____.
5. 我参加大考的前一晚上睡不好。
I can't sleep well _____ I _____ a big exam.