“没有永久不变的敌人,也没有永久不变的朋友,永久不变的只是我们的国家利益。”这说明国家与国家之间的关系是 ①变化不定的,这种变化仅与国家利益有关系 ②变化不定的,这种变化与国家的性质无关 ③经常变化的,这种变化必须以维护国家利益为前提 ④经常变化的,因为各个主权国家的国家力量也处在不断变化之中
He tries _____English well. And he practices _____English every day.
Students should study hard to make their dreams_____ .
The meat is _____dear and eating ____meat is bad for your health.
Do you enjoy ____football? I hear there will be a football match tomorrow.
Of the two coats, she ’d like to choose the ____one to save money for a book.