What the educational expert wants to stress is that ________ from worry and anxiety can definitely contributes to a child’s mental and physical health.

(2013·江西十所重点中学模拟)—I really admire the people full of ______.I'm always tired.—You'd better take more exercise.

I've ________ the habit of calling in on my grandparents on my way home from school.

The police are trying to find out the _______ of the woman killed in the traffic accident.

Carbon dioxide, which makes a ______ between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.