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。

On International Children's Day, some orphans (孤儿) from the Wuhan Welfare Institute for Children   1.  (take) to the park. An elderly westerner was with them. The children were eager to tell him everything that was going on. They held him by the hand and never hesitated to call 2.  Grandpa. This man was Professor William Dorrity, from Florida，USA. In 2003, 3.  Professor Dorrity and his wife retired, they came to Wuhan and started to work as volunteers at the Welfare Institute.

The Dorritys have been working hard   4.  (improve) the conditions at the Welfare Institute since they came. They often take children on day trips,   5.  (bring) along with them all kinds of food for the kids to enjoy. They recently bought audiphones for four orphans   6. hearing problems and small tape recorders for three blind children. They also bought a wheelchair for ten­year­old Tan Jun,   7.  suffers from a brain problem. With the   8.  (arrive) of spring, the Dorritys took the children for   9.  outing. “We love China and we love children,” Dorrity said, “  10.  we are happy to do this.”