English as a Second Language/sentences

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Question
1.Social customs greatly vary from country to country.
These cars vary in size: small, medium and large.

Are both sentences grammatically correct?
(1.)    In the first sentence, does it mean the same if I say, “Social customs are greatly different from country to country”or “there are great differences in customs among countries”?
(2.)    In the second, does it mean the same if I say, “These cars come in different sizes: small, medium and large”?

2.Mobile phone companies transmit communication or messages via towers.
With the use of the Internet, people can transmit a file from one computer to another in just a second.

Are both sentences grammatically correct?
(1.)   In each of the sentences above, does it mean the same if I replace “transmit” with “send”?

3.A competent secretary must be good at typing, filing and organizing documents.
I filed a claim with the company for a double charge on my credit card.

Are both sentences grammatically correct?
(1.) In the first sentence, can I leave out “documents”?
(2.)    In the second, can I say also, “I filed a claim with the company for overcharging my credit card”?

4.With the advent of the computer, many different kinds of criminal activities could happen in cyberspace.
The accident on MRT caused its operation to be suspended for a while.

Are both sentences grammatically correct?
(1.)    In the first sentence, what is the difference if I replace “in cyberspace” with “on the Internet”?
(2.)    In the second, can I say also, “The accident on MRT suspended its operation for a while”?

5.The store offers a big sale that is restricted to members and certain products only.
He is restricted from watching TV and playing computer games because his parents want him to focus on his school career.

Are both sentences grammatically correct?
(1.)   In the first sentence, does it mean the same if I replace “restricted” with “limited”?
(2.)    In the second, can I say also, “His parents restrict him from watching TV and playing computer games because they want him to focus on his school career”?

6.Wine usually tastes better when it has been preserved for a long time.
To promote animal rights, scientists travel far and wide to save and preserve endangered species.

Are both sentences grammatically correct?
(1.)    In the first sentence, can I replace “preserved” with “kept” or “stored”?
In the second, what is a substitute for “preserve”

Answer
1.Social customs greatly vary from country to country.
These cars vary in size: small, medium and large.

Are both sentences grammatically correct? Yes but "vary greatly"
(1.)    In the first sentence, does it mean the same if I say, “Social customs are greatly different from country to country”or “there are great differences in customs among countries”? Yes
(2.)    In the second, does it mean the same if I say, “These cars come in different sizes: small, medium and large”? Yes

2.Mobile phone companies transmit communication or messages via towers.
With the use of the Internet, people can transmit a file from one computer to another in just a second.

Are both sentences grammatically correct? Yes
(1.)   In each of the sentences above, does it mean the same if I replace “transmit” with “send”? Yes

3.A competent secretary must be good at typing, filing and organizing documents.
I filed a claim with the company for a double charge on my credit card.

Are both sentences grammatically correct? Yes
(1.) In the first sentence, can I leave out “documents”? The sentence would be incomplete.
(2.)    In the second, can I say also, “I filed a claim with the company for overcharging my credit card”? Yes, but the meaning is not identical.

4.With the advent of the computer, many different kinds of criminal activities could happen in cyberspace.
The accident on MRT caused its operation to be suspended for a while.

Are both sentences grammatically correct? Yes
(1.)    In the first sentence, what is the difference if I replace “in cyberspace” with “on the Internet”? None
(2.)    In the second, can I say also, “The accident on MRT suspended its operation for a while”? Yes

5.The store offers a big sale that is restricted to members and certain products only.
He is restricted from watching TV and playing computer games because his parents want him to focus on his school career.

Are both sentences grammatically correct? Yes, but either school or career in the second.
(1.)   In the first sentence, does it mean the same if I replace “restricted” with “limited”? Yes. "restricted" is a better choice though.
(2.)    In the second, can I say also, “His parents restrict him from watching TV and playing computer games because they want him to focus on his school career”? Yes

6.Wine usually tastes better when it has been preserved for a long time.
To promote animal rights, scientists travel far and wide to save and preserve endangered species.

Are both sentences grammatically correct? Yes
(1.)    In the first sentence, can I replace “preserved” with “kept” or “stored”? Yes
In the second, what is a substitute for “preserve”  protect  

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I can answer question about grammar, spelling, syntax, idioms, reading and/or writing that pertain to English as a Second Language. I am knowledgeable about both TOEFL and IELTS.

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