Itisnolongeraproblem_______thepoorchildreninthisdistrictcangotoschool.
MytrainarriveinNewYorkateighto'clocktonight.TheplaneIwouldliketotakefromthere______bythen.
一项调查表明,一些技术类期刊每一份杂志平均有5到6个读者。由此可以推断,在《小说月报》10000订户的背后约有50000到60000个读者。上述估算的前提是:
______thatnoonewaseverpreparedforit.
求线性方程组的全部解。