____ in reading the novel , he knewnothing about what was going on about him.

In the reading room, we found her _____ at a desk, with her attention _____ on a book[ ]

t go now, thanks again for your hospitality —— _________

Are these books______.— No, they are not mine. They belong to(属于)________.

When did he leave the classroom?—He left _____you turned back to write on the blackboard