Although the necklace is just made of ordinary stones, it still ________ young people.

I was once ashamed to admit my weakness, but now I have no such feeling and I _______    myself much discomfort.

Born into a family with three brothers，David was ________ to value the sense of sharing.

Although he is a well-known star, he never gives others an impression that he is _________ those who play with him.

Once air pollution       in most cities, it is hard      .