Jim一家人都非常喜欢帮助别人，他要在下次班会上介绍他们一家人参加志愿工作的情况，请帮他完成说话稿。

All of my family volunteer to help other people in our spare time on _小题1:_(周末). My brother is a senior high school student. Every Sunday morning, he make some _小题2:__(护士), on Saturdays, she usually goes to a special school to look after the _小题3:_(盲的) and the 小题4: (聋的). She likes them very much. As for me, I wish to be a good engineer in the future. So I often 小题5:__(修理) some _小题6:___(破损的) machines for my 小题7:__(邻居).

People often say because of our _小题8:___( 善良 ) ,my family bring them much pleasure.

Can you _小题9:__ (想象) how happy we are?

通常表冷器多长时间应除尘除锈（）

A、三个月

B、半年

C、一年