根据下列句子及所给汉语注解，写出空缺处各单词的正确形式，每空只填一词。
The air in the country is much      (新鲜) than that in the big city.
Instead of running away, the young man       (跳) into the river and saved the child.
No matter what kind of difficulties you meet, you should never give up       (容易地).
In the program Sing My Song, many great singers have       (写) many original songs.
There are some       (架子) in the room. They are low.