Many people in that area are so poor that they can’t ______ to go to hospital.

It was only as I got older _______ I got more curious about my background.[ ]

When you finish reading the book, you will have _______ better understanding of ______ life.

下列各句中，加横线成语运用正确的一项（ ）

Never before ________ to ________ what his parents expect of him more than it is today. [ ]