Thetheoryofblackholesinspace__(accept)bymanyseriousscientistsandastronomers.
资本主义生产自动化条件下，剩余价值的源泉是()
市场运行制度规则体系的核心是()
Therediscoveryofthisspeciesofbirdsisoneofthemost___(ordinary)scientificfindingsinrecentyears.
Ifyouhavedifficultylocatingaparticularbook，pleaseaskourlibrariansfor___(assist).
