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- .... he decided for Chinese.
Wouldn't it be better to say: ...he decided to learn Chinese, .... he decided to take up Chinese.
-It is very good to know many different languages for travelling, getting a job in a foreign country ... (the meaning should be: the knowledge of languages can be useful if you travell a lot ...
How would you correct this sentence?
"He decided for Chinese" is correct and means he has made a choice among two or more options. Your sentences are also right.
About your 2nd question: I didn't understand what you want to know exactly, but I guess you can say: "It is very good to know many different languages while travelling, helping you get a job in a foreign country "