Scenario CONTRACT IS VALID CONTRACT MAY NOT BE VALID If you think that contract may not be valid, please list the missing element$/$s

$1$ Claire sells her car to Simon for $$100$ X

$2$ Andrea books a flight ticket using rewards point of his credit card.

$3$ Alexandra reserves a kid horse riding tour for her daughter Sara.

$4$ Vivian buys marijuana at a cannabis store in Toronto.

$5$ Anne sells her house to James through a verbal agreement.

$6$ Jonas, $18$ years old, rents cross country equipment from the company ABC in Vancouver, British Columbia.

$7$ Giorgio buys dinner to a stranger sitting beside him at a pub.

$8$ Jesse buys a truck while in an evident drunken state.

$9$ A $10-$year$-$old kid sells homemade lemonade in front of his house

$10$ John signs an acceptance for an increase of his house rent under threats of eviction by his landlord