1.open-book exams 开卷考试
Is this an open-book exam?
这次是开卷考试吗？

2.an open book 容易被了解的人
I'd always thought of Johnny as an open book.
我觉得Johnny是一个特别容易被了解的人。
To them, my future was an open book.
他们觉得能一眼看到我的未来。

3.a closed book (to sb) 对之一窍不通的事物；不了解的人
Chemistry is a closed book to me.
我对化学一窍不通。
Makeup is a closed book to me.
我对化妆一窍不通。

4.be in sb's good/bad books 令某人喜欢/讨厌
He's in my bad books because he arrived two hours late today.
我对他没什么好感，因为他今天迟到了2个小时。
I cleaned the bathroom yesterday so I'm in Mum's good books.
我昨天打扫了洗手间，所以妈妈现在对我很满意。