题目内容：

根据句意和汉语提示，用正确的单词填空。

1.During her__________ (一生) she had experienced two world wars.

2.We all __________(坚持认为) that we should not rest until we finish the work.

3.Tony said he did something __________ (愚蠢的) when he was very young.

4.We should __________(呼吸) in the fresh air every day.

5.His third film__________ (标志) a great achievement in Hong Kong films.