——The relation between the two countries gets _________. A war seems to break out soon .——I hope they will make peace with each other .
A:worse and worse
B:better and better
C:more and more peaceful
Certain courses are compulsory; others are ____(选修的).
①骑在羊背上的国家 ②坐在矿车上的国家
③世界动植物的王国 ④足球王国