阅读下面的短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式（每空不多于3个单词）。
Philip is the bravest boy I know. His friends and family are all very ____(pride) of him.
Ten-year-old Philip was born with ____illness which means that he is always breaking his bones（骨头）. Although he has such a serious illness, Philip loves ____(play) sports. In January last year he started wheelchair racing. He came ____(two) in his first race, and since then Philip ____( win) every other race!
In order to look ____a new challenge（挑战）， Philip decided to take part in the London Wheelchair Marathon（马拉松）. ____ , five days before the race Philip got sick. He didn't want to give up . He finally made up ____mind to take part. Philip ____(give) medicine by his doctor and guess what He not only completed it, but he also finished in first place!
Philip behaves ____(brave) and never gives up. That's why he has been chosen to be the Bravest Child of the Month.
O2(g)==H2O(g);△H3，则△H1、△H2和△H3的关系是