My Life in SZ (18) - The Important Man Behind My Boss

The business was exceeding my boss's expectations,; they earned a lot.

They often invited us to take leisure at sea shore in the afternoon, or sang and danced in Da day on the beach in the afternoon, or to go singing and dancing at the disco club at night.

"day on the beach" sounds more natural to me this way (US English).

It's not surpriseing that I could dance until two or three clock in the morning, howeverbut now, I would not go there even paid to meif you paid me to.

Sister Wang (one of my bosses) drove a Toyota (car), which iwas expensive for us.

You can remove "car" here if you want. Many people often just say the brand name.

At that time, most of us even didn't even know how to drive.

I remembered an expert once said in a local newspaper predictingthat China would be a big vehicle big country / producer in 20 years.

Having both "once said" and "predicted" in the sentence is redundant, so you should choose one or the other. An example with "predicted":
"I remember reading in a local newspaper that an expert predicted that China would be a big vehicle country in 20 years."

We didn't believe that, since many of us couldn't imagine we can'd be able to buy a car one day.

In the Ddisco club room, sometimes we could meet some of sSister Wang's friends, and nearly all of them had cars.

She often talked loudly when sheand promised to delete their traffic fining lettercitations or record because her husband was a high-ranking police officer with a high rank.

"with a high-rank" is fine, but "high-ranking" sounds more natural.

She made a calls to her husband couldto solve many problems.

I saw her husband many times,; he was kind to us since we were his staff too.

He once said they had speeded up arranging for many families to migrate to Hong Kong because the handover of Hong Kong in 1997 iwas approaching, and so the families were working for them.

I didn't understand his words then, however,but I get his meaning now.

You can't use "however" in the middle of the sentence. You either need to start a new sentence, or use a semicolon to separate the two clauses.

My Life in SZ (18) - The Important Man Behind My Boss

The business was exceeding my boss's expectations, because they earned a lot.

They often invited us to take leisure at sea shoreparty with them on the beach in the afternoon, or sato sing and danced in D at a disco club at night.

It's not surpriseing that I could dance until two or three o'clock in the morning, however, now, I would not go there even paid toif they were to pay me.

Sister Wang (one of my bosses) drove a Toyota (car) which iwas expensive for us to buy.

At that time, most of us even didn't even know how to drive.

This is the more natural order in the US.

I remembered an expert once saipredicted in a local newspaper predictingthat China would be a big vehicle big country in 20 years.

We didn't believe that, because many of us couldn't imagine we canthat we could buy a car one day.

This is subjunctive tense.

In the Ddisco club room, sometimes we cwould meet some of sSister Wang's friends, and nearly all of them had cars.

She often talspoked loudly when she promised to delete their traffic fining letteres or records because her husband was a police officer with a high rank.

She would madke a call to her husband couldto solve many problems.

I saw her husband many times, h. He was kind to us since we were his staff, too.

He once said they had speeded up arranging for many families to emigrateion to Hong Kong for many families because the handover of Hong Kong in 1997 iwas approaching, and so the families were working for them.

The business was exceeding my boss's expectations, they. It earned a lot.

The second sentence would sound better if it said it earned a lot of money.

They often invited us to take leisurerelax at sea shore in the afternoon, or saing and danced in Disco club at night.

It's not surpriseing that I could dance until two or three o’clock in the morning, h. However, now, I would not go there even if you paid to me.

At that time, most of us even didn'tdidn’t even know how to drive.

I remembered an expert once said in a local newspaper predicting China would be a vehicle big country in 20 years.

I’m not sure what you are trying to say here. Are you trying to say that China would have a lot of cars in 20 years? The last part might be better “China would have a large number vehicles on the road in 20 years.”

We didn't believe that, m. Many of us couldn't imagine we canthat we could buy a car one day.

In the Disco club room, sometimes we cwould meet some of sSister Wang's friends, and nearly all of them had cars.

In the USA disco is more often called a nightclub.

She often talked loudly when she promised to delgete their traffic fining letter or record cleared because her husband was a police officer with a high rank.

In the USA traffic fining letter probably translates to “ticket”

SIf she made a call to her husband it could solve many problems.

I saw her husband many times, h. He was kind to us since we were his staff too.

He once said they had speeded up arranging for many families to migrate to Hong Kong because the handover of Hong Kong in 1997 iwas approaching, and the families were working for them.