They won't leave! Aaarrggghhh!

This is my second run through (trying to get to the secret area this time), and I didn't have any trouble with this the last time. But this time, there is a different set up.

1) There are three people in there. I swear there were only two people in the lab the first time I played. Of course, I'd done quite a bit of other exploring before going even going into the lab last time, but there was no Mrs. A, so I have no idea how to get rid of her.

2) Last time L.C. was gone from the lab as soon as I was told to look for "proof."

I'm pretty sure I've tried everyitem in my inventory, and I've left the lab a few times and come back, but they're all still there. I've seen posts about "annoying" them, but I am making no headway.

Have I missed a vital conversation somewhere? Am I missing something from my inventory? Someone please help me!

You're Carrying:

Beaker

Cup of Tea

Lighter

Shirt

Wire
Blue Paint

Disk with Virus

Mirror

Shoes

Wrench
Bottle Cap

Eraser

Perma-Tie

Slip of Paper

Chain

Glue Stick

Photos of Fashion Show

Soldering Iron

Chalk

Hot-Wiring Instructions

Rust Eater

Syringe

Your ultimate goal for the day is to get out of school. Before you do, however, you're looking to get your bag out from the classroom where you left it.

That is, however, not the only thing going on in school today.

"Agent" Laurente now has asked you to search the school for some evidence of aliens.

Hungry Mrs. Awatif is looking for something wriggly to eat and wants you to help her out.

Thanks much,
W.G.