Помогите с английским пожалуйста.

Complete the sentences by changing the words in brackets into correct correct forms

My granddad had a long career. He started work as an assistant and worked his way to the top. (assist.)

Being a firefighter is a very stressful (occupy)

It took Mark a long time to find a new job he was...for nearly two years.

(employ)

It takes a lot of hard work to be ... in this bussiness (succeed)

Mary is 60 next week and she's leaving , so remember to wish her'Happy ... (retire)