请帮我的翻译改改错~~

Many works were laid off because of the corporate restructuring.
The box must be handled carefully because there's a notebook in it.
The bad employer/employee relations lead to walkout.
He was so tired that we let him to go home to sleep.
The accident was the result of his careless driving.
Delays in treatment always result in serious illness.
Serious illness is often because that the treatment is delayed.
He passed the exam because he studied hard.