根据材料回答15题:
It was the late spring of 1979, a hot Saturday afternoon.Hundreds of us sat 21, side by, side, in rows of wooden chairs on the maincampus lawn (校园草坪).We22\' blue robes (毕业生长袍).We listened carefully to long 23.When the ceremony (典礼)was 24_,we threw! our caps in the air, and we were officially graduated from college.
After that, I found Morrie Schwartz, my 25professor, and introduced him to
my 26 ..He was a small man who took small steps, as ifa 27wind could; at any time, 28him up:into the cloudS! His teeth were in good shape: When he smiled it was as if you had just 29him the funniest joke on earth.
He told my parents how I 30 every class he taught.He told them, "You havea 31boy here.He helped me a 10t." Shy but32 , I looked at my feet.Before we left,I 33Mr. Schwartz a \'present, a briefcase with his name on the front.I didn\'t want to forget him.34I didn\'t want him to forget me.He asked if I would keep in35 , and without hesitation (犹豫) I said, "Of course." When he turned around, I saw tears in his eyes.{TS}