语法填空(共10小题；每小题1.5分，满分15分)
It was a city in Hubei Province.  On International Children's Day, some orphans(孤儿) from the Wuhan Welfare Institute for Children       (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   Grandpa.  This man was Professor William Dorrity, from Florida, USA.  In 2003,      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    (improve) the conditions at the Welfare Institute since they came.  They often take children on day-trips,     (bring) along with them all kinds of food for the kids to enjoy.  They recently bought audiphones for four orphans     hearing problems and small tape recorders for three blind children.  They also bought a wheelchair for ten-year-old Tan Jun,    suffers from a brain problem.  With the  (arrive) of spring, the Dorritys took the children for     outing.  "We love China and we love children," Dorrity said, "  we are happy to do this."