I haved stayed at my then-girlfriend's house for nearly one month, (simultaneously) looking for jobs in the newspaper. I had stayed at my then-girlfriend's house for nearly one month, (simultaneously) looking for jobs in the newspaper.

“Simultaneously” is unnatural (and unnecessary) here.

I have stayed at my then- girlfriend's house for nearly one month, simultaneously looking for jobs in the newspaper. I stayed at my then girlfriend's house for nearly one month, simultaneously looking for jobs in the newspaper.

This is simple past tense since she's not your girlfriend any more.

I felt a little bit anxious and could sense her frustration atfor not being able to help. I felt a little bit anxious and could sense her frustration for not being able to help.

you would be frustrated at "someone", and frustrated with/from/for "something".

I felt a little bit anxious and could sense her frustration at not being able to help. I felt a little bit anxious and could sense her frustration at not being able to help.

“Frustration at” is correct. You can see many examples here: https://skell.sketchengine.eu/#result?lang=en&query=frustration%20at%20not&f=concordance

I found a company (ABC) that was recruiting an English Translator, an English Diploma and some experience as asn English Interpreter awere the prerequisites. I found a company (ABC) that was recruiting an English Translator, an English Diploma and some experience as an English Interpreter were the prerequisites.

I found a company (ABC) was recruiting an English Ttranslator,. An English Ddiploma and some experiences as an English Iinterpreter awere prerequisites. I found a company (ABC) was recruiting an English translator. An English diploma and some experience as an English interpreter were prerequisites.

I found a company (ABC) was recruiting for an English Ttranslator, where an English Ddiploma and some experiences as an English Iinterpreter awere the prerequisites. I found a company (ABC) recruiting for an English translator where an English diploma and some experience as an English interpreter were the prerequisites.

I had (only) graduated from high school and normally couldn't have fit the position | have met the requirements. I had (only) graduated from high school and normally couldn't have fit the position | have met the requirements.

I graduated from high school and normally cwouldn't fitbe able to fill the position. I graduated from high school and normally wouldn't be able to fill the position.

Human beings usually have a big potential to develop a new skill set for a living. Human beings usually have a big potential to develop a new skill set for a living.

Human beings usually have a biglarge potential to develop a new skills for a living. Human beings usually have a large potential to develop new skills for a living.

賛成しました。

I decided to take the job because I needed it. I decided to take the job because I needed it.

I decided to take the job because I needed it. I decided to take the job because I needed it.

I decided to take the job because I needed it. I decided to take the job because I needed it.

This is past tense.

I found an advert with a phone number on the wall, phonesthe number belonged to a Fake Diploma Maker. I found an advert with a phone number on the wall, the number belonged to a Fake Diploma Maker.

I found an advert phone number on the wall, phoneson a wall with a phone number for a Ffake Ddiploma Mmaker. I found an advert on a wall with a phone number for a fake diploma maker.

I found an advert phone number on the wall, phones and called a Ffake Ddiploma Mmaker. I found an advert phone number on the wall and called a fake diploma maker.

また、 I found an advert number on the wall and phoned a fake diploma maker.

I became a university graduated student majoring in English after paying 200 Yyuan two days later. I became a university graduate majoring in English after paying 200 yuan two days later.

I became a university graduated student majoring in English after paying 200 Yuan two days later. I became a university graduate student majoring in English after paying 200 Yuan two days later.

ハハ！

This was another kind of traditional China's speed. This was another kind of traditional China's speed.

I don’t understand this. Maybe you mean, “This was another example of Chinese speed.”

This wais another kind of traditional China's speedbehavior in China. This is another kind of traditional behavior in China.

また、 - This is another kind of way things work in China. - This is an example of the kind of speed at which China works.

Probably some of you may look down upon it as it was a deceptive behavior. Probably some of you may look down upon it as it was deceptive behavior.

Probably sSome of you may probably look down upon it as it was a deceptive behavior. Some of you may probably look down upon it as deceptive behavior.

It was all done all for[for a living | to make a living], however. It was all done [for a living | to make a living], however.

It was all done all for a living, however. It was all done for a living, however.

Perfect use of "however" here!

Another two days later,go by and the boss of the company agreed to meet me at a coffee shop. Another two days go by and the boss of the company agreed to meet me at a coffee shop.

I bought an English dictionary immediately, and read, and recited (memorized?) day and night withduring those two days. I bought an English dictionary immediately, and read and recited (memorized?) day and night during those two days.

“Recited (it)” means “repeated (it) aloud from memory” (背诵). I think you probably mean you “memorized” it (you committed it to memory).

I immediately bought an English dictionary immediately,and read, and recited from it day and night within the two days. I immediately bought an English dictionary and read and recited from it day and night within the two days.