用所给词的适当形式填空
(1)It's time____(play)football.
(2)We want____(visit)the San Francisco next month.
(3)What about____(go)____(swim)tomorrow?
(4)—What are you going to do tomorrow? —I____(have)a party at home.
(5)She____(be)an English teacher next year.
(Ⅰ)求椭圆E的标准方程;
(Ⅱ)设P(﹣4,0),直线y=kx+1与椭圆E交于A,B两点,若∠APO=∠BPO,(其中O为坐标原点),
求k的值.
“各行星围绕着太阳转,各国的货币围绕着美元转。”确立美元这一特殊地位的历史事件是( )
①宣扬人人平等 ②宣布民族独立 ③追求民主自由 ④反对殖民统治