The conflict had developed into a stage ____ the two countries were gathering big troops on the border.

______ the assignment said above, you have to write a 200-word composition on environment pollution

didaccident happen—Oh, it was onSunday towards the end of this summer, as far as I can remember

.He went there on foot and got very tired, but he _____ by bus. The fare was rather cheap.

下列各句中加点成语的使用，不正确的一项是（ ）