根据句意和汉语注释，写出单词的正确形式。

1. She has struggled ________ (反对) cancer for almost ten years.

2. Remember to hold your ________ (呼吸) when you dive into the water.

3. He ________ (证明) his courage in the battle.

4. I'd rather stay at home to watch the ________ (实况转播) boxing match.

5. He must have taken the book ________ (既然, 由于) it isn't here any more.