When I need gas for my car, I pull into a gas station right around the corner from my house and use my gas card. Years ago, full-service gas stations were very ____20____. However, things have changed. Now, most gas stations are self-service centers. Personally, I ____21____ fill the car up with gas every time I stop. I generally _____22_____ in cash, but more and more gas stations accept credit cards. As gas prices are on the ____23____, I'm now thinking about buying a more fuel-efficient vehicle or just ____24_____ to work.