good virtual stocks to invest in the next 6-9 months, $100K starting budget?

this is a virtual stock game competition at my school and the time duration to sell would be in the next 6-9 months, the problem for me is that i cannot change what i buy!, so i can’t just do short-term investment and then sell it when it drops, which is what i want to do…i have to do investments that i keep for at least 6 months, i dont know for sure since i dont know when they actually determine and tell me who’s the winner. So the sell date is in 6 months, or half of a year, in 2010 of course. My idea is of course to diversify as much as possible but also keep penny stocks.

my first would be a major food production company, 2-3 energy companies, including alternative energy. A specific one for oil would be Exxon Mobil. Miscellaneous could be either gold or silver, a “drug” medicine stock, and foreign stocks. I will also take a few percent of the 100,000 and put into penny stock.

Since i get to start with such a high amount i have alot of freedom in what i invest, but i want to be careful though, because even though its not real its for a competition…(nation wide, but the winner is determined by the best performing at a school only)
anyone have any suggestions either specific ones or just general catagories all of them are appreciated!
no you dont have to make me money but if you have any good ideas or suggestions just let me know.

Thanks.