5. I've been trying to, but I don't think I'm up to this job.
我一直很努力，但我觉得我无法胜任这个工作。
还能这样说：
I have been working hard, but I feel I am not capable of this job.
I am on the job all the time, however I am little qualified for this job.
应用解析：
up in the air 挂在空中（悬而未决）

6. The job is out of my major.
这项工作不属于我的专业范围。
还能这样说：
The job is beyond my major.
The job is not related with my major.
应用解析：
job title 职位名称；
job step 作业步骤；
pull a job 抢劫

7. I wish to get into the advertising business.
我希望在广告业方面发展。
还能这样说：
I hope to take on the advertising business.
I would like to develop in the advertising business.
应用解析：
talk business 谈正经的，说正经话

8. I quit just because I see no chance of advancement.
我辞职是因为我没有升迁的机会。
还能这样说：
The reason why I resign is that there is no opportunity to promote.
The reason I leave the company is that I have no chance to get promotion.
谚语：
Monkey see, monkey do.
东施效颦。