根据句意和汉语注释，写出单词的正确形式。

1. Ability and effort are conditions of _______ (成功).

2 Some big cities are becoming more and more _______ (拥挤的) and polluted.

3. We haven’t decided how we are going to _______ (庆祝) the coming New Year’s Day.

4. I saw the winners’ names of the writing competition on the _______ (网站).

5. When you laugh or smile, your body ______ (放松).