They're

I hate those spiders. They're always there to freak me out when I'm cleaning.

My roommate is prodigal when it comes to spending money on movies; he buys them the day they're released, regardless of price.

They're making too much noise. I can't concentrate.

Now I have to leave, they're calling for my flight.

His whole family is like that. They're like peas in a pod.

The scuttlebutt is they're going to Australia.

Organic vegetables are popular because they're safe and tasty.

They're already here.

Those books look as if they're going to topple over any minute.

They're almost three times as big as we are.