题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

With only about 1,800 ones left in the wild, all giant pandas are precious. However, Qizai, 1.seven-year-old panda that lives at the Foping Panda Valley in China’s Shaanxi province, is even more so. That’s because he is among a handful of giant pandas 2.(know) to be the only one 3.brown and white fur in the reserve. The 220-pound Qizai has become a superstar, and many 4.(toy) in his color have been made. However, life has not always been easy for him.

It was when he was just two months old that Qizai was abandoned by his mother. He spent his early years at the Shaanxi Rare Wildlife Rescue Center. Then he 5. (send) to his current home, 6.there were many other giant pandas. However, the other pandas seemed 7.(dislike) him and often bullied(欺负) him by stealing his bamboo.

Researchers are not sure why Qizai has different fur. Some assume that the brown fur is a result of a gene problem and 8.(discover) by observing Qizai’s children.