stock是ownership of a company，trading stock不是工作. 倒賣商品，如果是開店大招牌，應該是retailing，算是工作 （work）。Work is not just employment. F1 student can only work on campus or under OPT training.
I am not specialized in immigration law, these are just my impressions.
I am not specialized in immigration law, these are just my impressions.
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