A Sims (PC) question
 

I try and keep a clean house. I've had flies before, when food is left out, but now I have a cloud of flies buzzing around the house! I've never seen this. There's no food out and everything is clean (I think.) They mostly fly around the bedroom but they go all over. They're killing my room score wherever they go! How do I get rid of them?
Thanks

can you call an exterminator or something?

Hire a maid and make sure all of your sims have showered

If you have unleased, you can train cats to catch flies.

I have a Sims question for anyone : Can you play more than one Sims expansion at once (Like House Party with pets or something)?

Yes. You can have as many expansions running as you like, but you'd better have a decent computer if you're going to run more than three, or it can slow to a crawl. Yet another expansion is coming later this year: Sims Superstar. C'mon Maxis, just make The Sims 2 already!