1.我们向李先生学习，因为他有丰富的工作经验。

2.由于我没有读过这本书，所以我无法对此作出评论。

3.由于很多学生缺席，我们不得不将会议延期。

1.We learn from Mr.Lee because he has enough work experience.

2.I can't make comment on this book because I didn't read it.

3.We have to put off the meeting because of many students absent.