根据汉语提示完成句子，词数不限。

1. 我不喜欢响亮的音乐，它不如轻柔的音乐令人放松。

    I don't like loud music, because it's _____ than quiet music.

2. 别担心这次考试，尽你最大的努力。

    Don't worry about the exam, just _____ .

3. 说起他的儿子，李先生就为他自豪。

    _____ his son, Mr. Li is proud of him.

4.杰克缺席的原因是他生病了。

    Jack's absence was _____ .

5. 我妹妹比我学习用功点。

    My sister studies _____ than me.