根据句意及汉语提示，用单词或短语的适当形式填空。  

1. I forgot many things as time _____ (流逝).

2. He _____ (意识到) that he got on the wrong bus.

3. Never be afraid to make _____ (错误).

4. The boy did the job _____ (容易地).

5. They _____ (组成) one-third of the province's population now.