1 . He c______（犯，做）a crime when he was in his twenties. （根据中英文提示拼写单词）

3 . 人们普遍相信，只要科学家们致力于开发新能源，环境就不会一直处于污染的状态。
(believe, commit, discover, remain)
It ______ that __________, our environment ______.

4 . The president is ________________(commit) to reforming health care. (所给词的适当形式填空）