I hate ________ when someone makes a mess of my learning materials on my desk.

I didn’t know which bag was better than the other, so I took them________.

He is one of the students, who, I’m sure, always do _____best.

I need some red ink badly, but there’s _____ at hand.

—Which of these two English books will you borrow?—I’ll borrow ____________ of them because they are very interesting.