1. 用所给词的适当形式填空。

1. （1） The work of the charity is funded by voluntary (donate). 
   
3. （2） With the progress of history, the old (politic) system had become unable to adapt to the requirements of economic and social development.
   
5. （3） Another key factor is likely to be whether national social (secure) programs decide to pay for the treatment.
   
7. （4） We will continue to support the work of the (volunteer) sector and promote volunteering.
   
9. （5） The rules do not permit much flexibility in their (operate), so it is important that they operate fairly.
   
11. （6） There were no (sew) machines at first so everything had to be sewn by hand.