Maria, can I _____ your English notes today? You see, I want to improve mine. — Go ahead. [ ]

The professor’s research finally proved to be ______, though he had spent a lot of money on it.

“Do you mind if I look at your notes”—“Of course not _______”

. ________ when the boulders suddenlydisappeared.

Paul’s mother is a nurse. She works a hospital.