Went / Kate / it / for five years / had

1) went / Kate / it / for five years / had / for that company / working / when / been / out of business. - Kate had been working for that company for five years when it went out of business.

2) all day / Mark / to sit down / wanted / he / because / had /standing / been / at work. - Mark wanted to sit down because he had been standing at work all day.

3) teaching / a year / Jack / had / than / he / for / been / more / before / at the university / left for Asia. - Jack had been teaching for more than a year before he left for Asia.

4) long / studying / How / moved / you / been / Japanese / before / had / you / to Tokyo? - How long had you been studying Japanese before you moved to Tokyo?