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Here you go:

When I was studying at UAL, I had known Dops as one of the largest integrated food companies in the world, and is expanding business in West. Worked as a food engineer and have finished my M.Eng. degree this fall, I do believe that I should contribute my professional knowledge to the development of Dops Corp.
Comments  
I would say that the sentences are fine but there are slight parts that need adjusting:

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When I was studying at UAL, I had known Dops as one of the largest integrated food companies in the world, "which was" expanding business in "the" West. "I" worked as a food engineer and finished my M.Eng. degree this fall "and" I do believe that I should contribute my professional knowledge to the development of Dops Corp.
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The alterations are contained within quotation marks - "..."

Anyway, that's how I could write it! Emotion: stick out tongue
Thanks so much for your reply.
But for native English speakers weather the sentences

"I worked as a food engineer and finished my M.Eng. degree this fall and I do believe that I should contribute my professional knowledge to the development of Dops Corp"

contain too many "I"s. Will they make readers nervers?
What is your opinions about that?

Thanks again for your help!

And have a good weekend!
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Hello, June.

I can point out some improvements for these sentences.

1. In the first sentence, you begin with the past progressive ("was studying"). That implies action that has not yet finished. Then you move on to the past perfect ("had known"). It is not possible for the past perfect to occur with the past progressive. That is because the past perfect refers to action completed before some point in the past. The best remedy for this case is to turn "had known" into "knew." I think that you want to say that you knew about Dops while you were studying at UAL.

2. There is also a problem with the word "is." To what do you mean it to refer? As it stands, it is being used as the verb for "I," since that is the only subject in this sentence. Perhaps you mean to say "and it is expanding business in [the] West."

3. In the second sentence, you should put "I" before "worked," since these sentences do not appear to be written for the body of a resume.

4. "Have finished" should be "finished." Since you finished your degree this fall, it is already complete and therefore should be in the simple past tense. "Have finished" is in the present perfect tense and refers to action completed in the present. I assume, of course, that this message is going to be sent out after graduation.

5. Change the comma after "fall" to a period.

6. The word "should" is not a grammar error, but I think you mean to say something different, such as "can" or "will."

I hope this helps!

Mike
Hello, Mike.

Your suggestion is helpful and I learn a lot. Thanks!

June
please corecct the following sentences:

anyone who hasn't claim their remaining holiday must put forward their application ASAP.
Teachers: We supply a list of EFL job vacancies
I would change this to

"anyone who hasn't claimed their remaining holiday must put forward their application ASAP"

hope this helps!