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Please check if these tenses are correct. Thanks in advance!
(Here might be some typos. I had to fill only underlined words)

Past simple, past continuous or past perfect? Fill in the gaps with the correct form of the verbs in brackets.

Sharon Embley started (start) working as Deputy Marketing Manager for Fleur de Lys Cosmetics three years ago. It was the kind of job she always wanted (always / want). Competition for the post was (be) really though, and she knew she was (be) selected because of her experience in marketing, which she gained (gain) in her previous job with a pharmaceutical company.

Sharon was (be) young and ambitious. She was also a person of absolute moral integrity. In fact, she applied (apply) for the post with Fleur de Lys mainly because the company prided (pride) itself on its ethnical business practices. Its image was built on natural ingredients, environment-friendly packaging, and a ban on animal testing. This image reflected (reflect) the values which Sharon always cherished (always / cherish).

Things were going (go) really well, until one day a file landed (land) on her desk. She didn't know (not / know) the file was not meant for her, or that it contained (contain) confidential information. She read (read) it all, and discovered (discover) to her amazement that Fleur de Lys was not as "clean" as it claimed to be. It was (be) true that they did not test their products on animals, but only because they did not need to: other laboratories had already tested (already / test) the ingredients on animals!

Ironically, the day before she read (read) the report, the director had called (call) her to her office. She informed (inform) Sharon that she was planning (plan) to promote her very soon as the current Marketing Manager was due to retire.

Sharon didn't experienced (not / experience) such confusion for a long time. What should she do? If she blew (blow) the whistle, she would not get promoted and even might even be dismissed. And if she kept (keep) silent...
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I only see a few minor problems, as noted:

It was the kind of job she had always wanted

which she had gained (gain) in her previous job

This image reflected (reflect) the values which Sharon had always cherished

She had informed (inform) Sharon

Sharon hadn't didn't experienced (not / experience) such confusion for a long time.
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Thank you very much Ray!
I have another versionEmotion: smile

"In fact, sheapplied (apply) for the post with Fleur de Lys mainly because the company prided (pride) itself on its ethnical business practices".

"In fact, sheapplied (apply) for the post with Fleur de Lys mainly because the company was proud itself on its ethnical business practices".

(I have rarely heard the verb "pride" in any Past tense itself, more usual it is used as adjective with the the verb "be", so in Present Indefinet it will be "to be proud" and in the Past-"was/were proud" and however you don't have "to be" here, I think it is more appropriate)

"Things were going (go) really well, until one day a file landed (land) on her desk."

"Things were going (go) really well, until one day a file was landed on her desk."

(I think you have to use Passive voice here, as somebody landed (left) the file on her desk, so the file didn't do this action by itself)

Sharon didn't experienced (not / experience) such confusion for a long time.

Sharon didn't experience (not / experience) such confusion for a long time.

(I think, you accidentally typed the unneccessary "d" at the end of "experience". As you have already used Past Simple in the negative part "didn't" you should use next verb "experience" in the infinitive)

But generally, you did great job) congratulations!