Will Jack get out alive?

Did you watch 24 tonight? Yeah, so all of CTU is trapped in sealed rooms and may die from Centox gas. Yeah, and at 9:30, Fox showed scenes from next week's episode. It kind of ruined the suspense. I mean, you just know Jack is going to live. Sure. But it still ruined it for me. Stupid. They should get an earful from fans more dedicated than me.