She is ready to help people ________.

You look tired.— YesI ___ non-stop until 8 o’clock

Try to smile more because a smile costs_______, but gives so much.

(2014·日照模拟)The young man was modest and worked hard，and gradually managed to________his status

下列各项中，加点的词语使用不恰当的一项是（ ）