New lab puppy not house broken, advice?

i'm watching my sister's new puppy (he's a black lab) he's cute and playful buh has a bitting problem, HE BITES EVERYTHING from cords to blankets to even mi when i'm walking! i work tomorrow for 6hours and have to leave him alone, this will be his first time by himself i kno he will cry... i donno wut to do! should i keep him outside where the heat might get to him and having him rips apart my moms garden (which would be hilarious, buh she would be so pissed) plus he'll be cryin the whole time... or inside in one room, hoping to god he doesn't tear up anythin?