Say:
He is living with his parents in the USA.(You didn't space between paragraphs.
He is unhappy because he cannot read and write English very well.
Or:
He is unhappy because he cannot read and write English as well as he would like to.
It's hard for him to get a job.
He didn't study English very hard while he was living in Vietnam.
social problems
In my opinion
developed countries)
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