题目

Two weeks ago my grandfather passed away. It really put me into deep ____because my grandfather held a unique position in my life. For me, my grandpa was not only a ____ family member but a tutor (导师) who encouraged me to work hard and ____ well.I’ll never forget the first time I read a long piece of his writing. It was when I ____ for Princeton and he offered to write to the university on my behalf. He wrote in beautiful ____ and used poetic language, unafraid of sounding too “flowery”. I read the ____ out loud so I could hear the rhyming sounds.My grandfather ____ hard work. Every 椭圆方程为x2a2+y2b2=1，a，b∈{1，2，3，4，5，6}，则焦点在y轴上的不同椭圆有______个．