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.