With the world _____ fast, we have something new to deal with all by ourselves every day.

What do you think of your last ______—I had a very scary experience in the mountains. I won’t go there again.

What age did you leave home—I left home at 18,Neil. I _____ your city for five years.

_________ of us knows how manyof them have been killed in that accident.

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.