1Walter offered us a lift when he was leaving the office,but our work_,we didn't accept the offer.
2The production _ steadily,the factory needs an ever-increasing supply of new material.
1空填：not being finished 2空填：having gone up
为什么2句不和1句一样用被动语态的独立结构呢?the production与our work不都是被……吗?