I am going to purchase US$ 1000$1000 USD this morning, so I checked the currency exchange rate of US$ to CNY (Chinese Money) just now. I am going to purchase $1000 USD this morning, so I checked the currency exchange rate of US$ to CNY (Chinese Money) just now.

"$1000 USD" is how I have seen it written most often, but it might be stylistic.

I am goplanning to purchase US$ 10001,000 USD this morning, so I just checked the currency exchange rate of US$D to CNY (Chinese Money) just nowyuan). I am planning to purchase 1,000 USD this morning, so I just checked the exchange rate of USD to CNY (Chinese yuan).

You use "going to" when you're 100% sure you're going to do something. But let's say the exchange rate was horrendous, then you might have changed your mind and not have gotten your money exchanged. Hence, the change from "going to" to "planning to." I also reformatted the money expressions to reflect the usage I see more often.

It remains high ast 7.30 from the Dollar to CNY. It remains high at 7.30 from the Dollar to CNY.

It remains high ast 7.30 from the Dollar to CNYCNY per USD. It remains high at 7.30 CNY per USD.

The rate fromexchange rate between CNY toand the US Dollar has fluctuated inD has been fluctuating over the past few years. The exchange rate between CNY and the USD has been fluctuating over the past few years.

It's still fluctuating so "has been fluctuating" is better. "Over the past few years" also better communicates the continuity.

At the first dropping, we were afraid CNY would devalue to 7, 8, andor even to 10. At the first drop, we were afraid CNY would devalue to 7, 8, or even to 10.

It would be one of those three values and not all of them, so you would use "or"

At the first Initially, when the rate started to dropping, we were afraid CNY wouldfeared the CNY might devalue to 7, 8, andor even to 10. Initially, when the rate started to drop, we feared the CNY might devalue to 7, 8, or even 10.

"afraid" is also okay, but "feared" might convey the direness of the situation better.

Later, as I discussed with my friends and I made a consensus that CNY wouldn't fall below 7.35. Later, my friends and I made a consensus that CNY wouldn't fall below 7.35.

The first one is a little awkward, but okay.

Later, as Ifter discusseding with my friends and made, we reached a consensus that the CNY wouldn't fall below 7.35. Later, after discussing with my friends, we reached a consensus that the CNY wouldn't fall below 7.35.

"reach a consensus" is the proper expression. You can't reach a consensus without first finishing a discussion.

I made a screenshot of the line graph, in which it can be seen that beginning from February this year, the US$ has been on an upward trend. I made a screenshot of the line graph, in which it can be seen that beginning from February this year, the US$ has been on an upward trend.

I madetook a screenshot of the line graph, in which can be seen that beginnshows that starting from February this year, the US$D has been on an upward trend. I took a screenshot of the line graph, which shows that starting from February this year, the USD has been on an upward trend.

The proper expression is "took a screenshot." I fixed the rest of the sentence to make it more natural sounding and grammatically correct.

While I believe the CNY rate can be controlled by the government. I believe the CNY rate can be controlled by the government.

Or "While I believe the CNY rate can be controlled by the government, [I also believe...]"

While I believe the CNY rate can be controlled by the government to a certain degree. I believe the CNY rate can be controlled by the government to a certain degree.

While is often used as a conjunction, using it with just one independent clause is awkward. (<- Example of the usage of "while") I added "to a certain degree" to better communicate the reality of economics.

However, I also deem it's impossiblebelieve it's unlikely for thate CNY will have the capability to challenge the US$D in the next 20 years. However, I also believe it's unlikely for the CNY to challenge the USD in the next 20 years.

Using "believe" here improves the flow of the paragraph. "Impossible" sounds way too definite and probably can only be made after extensive research as a skillful economist.