1. 选词填空

have a role, do one's part, work on, be bad for, cut down

1. （1） Reading in poor light  people's eyes.
3. （2） As a member of the international society, we .  
5. （3） The chairman asked me to  the report, because he didn't want to speak for too long at that meeting.
7. （4） He returned to America where he set out to  a new novel.
9. （5） In the past decade, the administration has  in environmental protection.