It depends what you need it for? If its an introduction paragraph start with something like a fact "This year oil prices have grown 12% due to..." (Not true fact, just an example). Or you could start with a quote. Just NEVER start with "I think Oil is becoming..." that's got a bad grade or w/e written all over it. But it would help if you said what kind of paper it is, and what the main topic is.
Why have oil stock prices lagged way behind the increase in the price of oil and the price of gasoline and the record profits of oil companies? This one was brought up by Sen Joe Biden on Meet the Press. Oil companies are clamoring for rights to drill offshore. Biden says they already have approval to drill 30,000,000 acres off-shore and they haven't touched any of it. He says they are really trying to get relief from environmental regulations before a new administration moves in. I am just quoting him-I can't attest to the facts.