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Do what you like and stay in one place for a long time, and your salary will naturally increase.
It depends on how your boss behaves.
Poor little. You didn't sign a contract, do you have any other evidence that you work for this company and get paid? Otherwise, you won't get double your salary.
What can you do? Will the taxes take care of you? If you go to sue him, who will pay attention to you, and then it will be better for you to find a job by yourself. Work hard, and when you have achievements in the future, you will be good to your employees.
It must be harmful, the furniture paint surface has formaldehyde, and the new furniture content is higher, so it is not good that children will be deformed.
You can complain to the Labor Inspection Brigade!