Select ALL the sentences that use impenetrable properly:
○ The medication made Trevor’s brain so foggy that even the simplest question seemed impenetrable to him.
○ I tried to poke a hole in the fabric with a toothpick, but it was as impenetrable as metal.
○ The castle was built with impenetrable defenses including a moat, high walls, and cannons.
○ Justine has such an impenetrable personality that just about everything upsets her.
○ The medication made Trevor’s brain so foggy that even the simplest question seemed impenetrable to him.
○ I tried to poke a hole in the fabric with a toothpick, but it was as impenetrable as metal.
○ The castle was built with impenetrable defenses including a moat, high walls, and cannons.