We must do everything we can _________ our earthclearer and safer.

from fatherto son, the music has not changed for eight centuries，and among the richer Naxi people,________ knowledge of this music showed that you were ________real gentleman.

I really enjoy listening to music ___ it helps me relax and takes my mind away from other cares of the day.

at he has missed his ________, he’llhave to wait for the next round

How old is your grandpa —He is seventy-nine years old and next year he’ll be ________.