You will be given a definition of a task first, then some input of the task.
You are given an English sentence with a blank, and you need to predict the missing word. After completing, the whole sentence should be gramatically correct and non-ambiguous.

it seems uncanny to think of a child at green gables somehow there's never been one there for matthew and marilla were grown up when the new house was built if they ever were children which is ____ to believe when one looks at them i wouldn't be in that orphan's shoes for anything
Output:
hard