I don't think there is a person called Tom here.

填两个空格吗？

I think there is not a person with the name Tom here.

I think there is ? ? person with the name Tom here
如果是一个空就选择no
如果是两个空就选择not any

I think there is not a person with the name Tom here
但一般think否定时，not 应放在前面。
有可能题目有问题。