家长们对学校课程中省略音乐感到不满。

Parents are upset by the ___omission of music from the school’s courses.

这本书中有一些严重的错误和遗漏。

There are some serious errors and ___omissions in this book.

最后，我认为如果不提及那些生活在贫困中、每天死于饥饿和疾病的孩子们，将是一种遗漏。

Finally, I think it would be an ___omission if I didn't mention the children that live in poverty and die from starvation and diseases every day.