英语句子填空

英语句子填空
“一位有30年教龄的老先生.”一个句子的不同英语表达方式
1.That old man ___ a teacher ( ___ to teach) 30 years ago.
2.That old man ___ ___ as a teacher in a school ___30 years ago.
3.It is 30 years ___ the old man began to ___ in a school.
4.Thirty years ___ ___ since the old man ___ to teach in a school.
5.That old man been a ___ in a school ___ 30 years.