Learn Arabic. Fast!
Nearly 75% of Dubai’s citizens are expats who mostly speak English or other languages such as Tamil, Urdu, Chinese, and countless others. However, Arabic is the national language for written and verbal communication in this city. Every government office and affair is still conducted in Arabic, and so are their published laws.
Although Arabic is the national language, you can get by just by speaking passable English. After all, most expats who reside in this metropolitan barely find themselves in a situation where they have to speak fluent Arabic. However, Emiratis are probably more welcome if you are willing to learn Arabic.