Is there any preposition amd or article mistake here ?

[duiter]

Dear teachers,

Is there any preposition and or article mistake here ?

On the one hand, there are several cogent reasons why transnational business organisations and their merchandise are worrying development.
On the other hand, a global company and its goods are highly beneficial for its loyal customers and its host country.
One of the substantial benefit of attending tertiary education is to have a wider experience which might benefit its student considerably.
Another reasonable cause of going to university is to move a job ladder.
Thirdly, the main basis of studying at higher education institution is to acquire intimate knowledge of, for example, astronomy.

Thanks

[bhaisahab]

Dear teachers,

Is there any preposition and or article mistake here ?

On the one hand, there are several cogent reasons why transnational business organisations and their merchandise are worrying development.
On the other hand, a global company and its goods are highly beneficial for its loyal customers and its host country.
One of the substantial benefit of attending tertiary education is to have a wider experience which might benefit its student considerably.
Another reasonable cause of going to university is to move a job ladder.
Thirdly, the main basis of studying at higher education institution is to acquire intimate knowledge of, for example, astronomy.

Thanks

They are all unnatural. Changing or adding articles or prepositions will not help much, they need to be rewritten .