Complete the landlord's slightly unusual text message to his new tenant.

You are welcome to keep your pet llama in the apartment, _____ he doesn't practice his tap-dancing routines after 10 PM.

The correct answer is provided that.

"Provided that" means "on the condition that" or "only if." The landlord is allowing the pet only on the condition that it stays quiet at night. "Unless" would mean the llama is allowed only if it does practice late-night tap-dancing!