Aftersomanydayswithoutrain,thegroundquickly________thelittlerainthatfelllastnight.

Othersarguethatsincetheearthhasenduredalongstringoficeagesinthelasttwomilliontothreemillionyears,anywarmingis________tobetemporary.

Wemust______thattheexperimentiscontrolledasrigidlyaspossible.

著名的罗马圆形大竞技场建于罗马帝国的()

对资本主义工商业改造的方法是和平赎买。