—Yes ,____ .
20世纪80年代,我国出现人口大规模流动的原因是( )①国家统一安排迁移 ②农村剩余劳动力过多 ③国家政策的允许 ④城乡之间的巨大收入差异
He held a glass with care because he was afraid of ____ (break) it.
劳____ 桌____