URGENT: Essentially depositing at 2 universities

<p>I wasn't really sure where to put this but, here goes. I have put a deposit down at a university in the US, however, I have also "firmed" a conditional offer from a university in the UK. My examination results, upon which my offer from the UK university is conditional, come out in early July. I have already paid the deposit for the US university but now they want another housing deposit. The UK university is my first choice. If I achieve the offer I will go there and then turn down the US university in early July. Is this all still allowed? Or if I put down a housing deposit is there some fine print that binds me? My guidance counselor says this is allowed but July just seems awfully late. Then again, if I don't meet my offer I will be thankful I kept my US option open.</p>