几道英语改错题,
问题描述：
几道英语改错题,
1.New research suggests that the chemicals we [use] to clean and disinfect [could] be damaging the environment [in] killing off algae [at] the base of the food chain.
2.Their lab and computer experiments 【showed】 objects 【shaped】 like M&Ms—squashed spheres—which can be packed together more 【tightly】 than spherical ones 【do】.
要正确答案和正确写法
答
1 suggest 虚拟语气从句谓语用（should）be,could 改成should或者省略.
2 than比较前后谓语一致,do 改成are或者省略.