Great attention must be paid _______ welfare, especially in the poor area.
As soon as all the chairs are _______, we can let the people _______ outside enter.
A pop star, _______drug abuse, may get an 18-month prison term.
In the reading room, we found her_______at the desk, with her attention______on a book.
——Is there any possibility______you could pick me up at the airport? ——No problem.
________ of her happy childhood by the song, Grandma sang along with it in a soft voice.