Ⅰ 用省略句改写下列句子
1．While I was walking along the street, I heard my name called.
While_walking_along_the_street,_I heard my name called.
2．When it is possible, people should use reproducible energy instead of fossil energy.
When_possible,_people should use reproducible energy instead of fossil energy.
3．He looked everywhere as if he was in search of something.
