用所给单词的适当形式填空
1. They refused to give any interviews to __________(journal).
2. Edison won his spurs as an __________(invent) while rather young.
3. The piece of bamboo makes a __________(music) sound.
4. My parents are worried about the __________(safe) of me all the time.
5. The air was __________(pollution) by factory smoke.
