在对农业进行社会主义改造的过程中，经历的三个发展阶段是______。
马克思、恩格斯曾设想向社会主义社会过渡过程中变革所有制的方式有___________。
I know it isn ’t important but I can ’t help ________ about it.
________ so many people in the United States been out of work as today.
Matter is the name ________ (give) to everything which has weight and occupies space.
