Volunteering is becoming more and more popular in the world because it gives us a/an __________ to value (珍惜) what you have, and focus on the truly important things in our life.

Yao Ming is well-known _________ a player.He is good _________ playing basketball.

We have been told that under no circumstances _________ the office telephone for personal affairs.

Would you like ____ basketball with us— I’d love to, but I feel like ____ something first.

When you see some waste paper on the ground, you should _______ and put it in the trash bin.