1 . Half of my classmates are ___________(志愿者) of different community service projects.

2 . He was arrested after being kept under constant s__________.

3 . A v_______ refers to a person who does a job without being paid for it. （根据首字母填空）

4 . After the fire, many medical teams and soldiers came to their r_________. （根据首字母填空）

5 . __________ refers to a piece of metal used for fastening the two ends of a belt, for fastening a shoe, bag etc, or for decoration.

6 . Troops fired on demonstrators near the Royal Palace causing many c___________.