Something kept nagging at the back of his mind, something Wendy had said.

But something kept gnawing at the back of his mind, and he did not like it at all.

"Walk with me," Earl told him, keeping a brisk pace toward his office at the back of the department.

"We're keeping you new fellows at the back of the line, if you get what I mean."

Matthew appeared occasionally in riding clothes, and what was more, kept horses somewhere at the back of the house.

All you need to do is to keep the wind, when it comes, at the back of your head.

All you've got to do is to keep the wind at the back of your head.

The house is neat and well kept with a bit of a vegetable garden at the back.

Yet, something kept nagging at the back of Leo's mind.

Until she forced herself to speak the words, she'd been keeping the fear only half-formed at the back of her mind.