An unpaid contract refers to a contract in which one party only enjoys contract rights without paying any consideration. In other words, one party in the contract gives the other party some benefit, and the other party does not need to pay any price to obtain the benefit. According to the definition above, Which of the following options are not free contracts:. ['Pharaoh has no children under his knee. He donated a property in his name to his nephew who has always taken care of him, and signed a gift contract with the other party.', "He invited Li to work in his company and signed a contract with Li, promising that if Li worked in the company for 5 years, he would get 10% of the company's shares.", 'Li Mou was going to study abroad for half a year, and he was unwilling to rent out the newly renovated house. Then he negotiated with his friend Wang and handed his house to Wang as his caretaker.', 'Huang lent his car to his colleague Zheng for use, and signed an agreement with Zheng to lent it to him for one year, without paying the user fee, but to return it as scheduled.']