If a bag is filled with books and pens, it must belong to someone __________works hard.[ ]

I didn’t see you at the meeting yesterday.– I _______ an important report at that moment.

Peter, do you know who _______ my dictionary?- Sorry, I don’t know. I _______ it.

There’s _______in today’s newspaper. It’s helpful to our study.

Have you finished reading The Twilight Saga? —No, I _______ my homework all day yesterday.