1.D ,by 介词加 动名词 这里是卖报纸卫生,C ,deliver 是投递,送报的意思2.D that,这里面是带刺。flour不可数。但是可以加量词如 a bag of flourMan/people can not live without water. I was led to the office by Rhe cleck.
D,D第一个是by引导的动名词,by doing第二个weather为不可数名词,用that代替