5. It is a pity that you will withdraw from our exhibition next month.
很遗憾你下月就要离职了。
还能这样说：
It's pity that you will quit your job next month.
I am sorry that you will depart from our exhibition next month.
应用解析：
withdraw money from the bank 从银行取款；
withdraw one's eyes from 把视线从……移开；
withdraw a bill (demand/offer) 撤销议案，要求、建议

6. The company discharged some people whose ages are beyond 58.
公司解雇了一些年龄超过58岁的人。
还能这样说：
People older than 58 were dismissed from the company.
People who were more than 58 were laid off by the company.
应用解析：
discharge from the ears 耳屎；
the discharge of water 水的流量

7. The contract is due so I have to leave the factory.
合同到期，我得离职。
还能这样说：
The factory relieves me of my post because the contract is due.
At the expiration of a contract, I have to resign.
应用解析：
factory一词最为普遍，指产品生产或装配的工厂；
works意为较大的建筑物群及其机器设备，一般并不生产成品；
plant多用于美式英语，尤为工业加工者。

8. I received a letter which noticed me to be eased out of the position.
我接到通知说我被免职。
还能这样说：
I was noticed that I was fired out of the post.
There was a notice that I was kicked out of the post.
应用解析：
ease back (on) 轻轻地拉回；
ease down 减低；
ease off 减轻；价格稍稍下跌