At the Olympic Games, only the athletes who have reached the agreed standard for their event will be______as competitors.

Time should be made use ______ meaningful things.

 —Will you read me a story，Mummy?—OK.You ________ have one if you go to bed as soon as possible.(2011·陕西)

While income worry is _______ rather common problem of the aged, loneliness is another problem that _______ aged parents may face.

 Almost _______ of the students in this class wear glasses, that is, _______ of them.