He ____ some money ____ me.
已知点F1,F2分别是双曲线x2a2-y2b2=1的左、右焦点,过F1且垂直于x轴的直线与双曲线交于A,B两点,若△ABF2为锐角三角形,则该双曲线的离心率e的取值范围是( )
作为小历史学家的你,如果想要研究唐朝时印度和西亚的历史,最好的参考书是( )
We can surely overcome these difficulties as long as we are________united.