—Excuse me．Where is Mr. Green's office?

—It's on ________ floor．

A．seven                  B．the seven         C．seventh               D．the seventh

My son Joey was born with club feet．The doctors told us that he would be able to walk，but would never run very well．By the time he was eight，you wouldn’t know he had a problem when you saw him walk．
The children in our neighborhood ran around playing，and Joey would join them， run and play，too．We never told him that he probably wouldn’t be able to run as well as the other children．So he didn’t know．
In seventh grade he decided to go out for the cross-country team．Every day he worked harder and ran more than any of the others．Although the entire team runs，only the top seven runners score for the school．We didn’t tell him he probably would never be on the team，so he didn’t know．
He continued to run four to five miles a day，every day - even the day he had a high fever．I was worried，so I went to see him after school．I found him running all alone．I asked him how he felt．"Okay，" he said．He had two more miles to go．Yet he looked straight ahead and kept running．We never told him he couldn’t run miles with a high fever．So he didn’t know．
Two weeks later，the names of the team runners were called．Joey was Number Six on the list．Joey was on the team! He was in seventh grade．We never told him he couldn’t do it!
【小题1】The doctor believed Joey would never run very well because ____．