(2013·山西高三诊断)It ________ me how we could improve the situation.

(2013·福建毕业班质量检查)—What does PM 2.5 mean?
—It's a professional ________ indicating the condition of air pollution.

He didn't ________ what I said because his mind was on something else.

Eye doctors suggest that a child’s first eye exam____at the age of six months old.

For ages, Bill Gates has been supporting educational programmes that ______from kindergartens to universities.

Poor health does not rule out happiness except for the ______ or those in pain.

Itis ______ to have achieved so much in such a short time.

Research shows that humans ______ from selfish to unselfish behavior when they are watched.

The problem with seeing famous tourist attractions is the steady＿of people all trying to see the place at the same time, so I doubt whether it is worth it.

一Mae Whitman's mother is a voice-artist and her father builds sets on stage.
――＿＿she ended up in acting.