Gift contract: A contract in which the donor gives his property to the recipient free of charge, and the recipient indicates that the gift is accepted. In the following cases, which of the following is not a gift contract? ['In order to encourage his nephew Wang Jun to study hard, Wang promised to give Wang Jun a computer and a camera, but give the computer first, and then give the camera when the final grade is good.', 'At a large-scale disaster relief charity event hosted by a civil affairs department, a company announced in public that it would donate 1 million yuan to a disaster relief fund established by the civil affairs department.', "A sees B's financial difficulties and gives 500 yuan to B. B doesn't want to. A is not in the drawer of B while B is not in.", 'Company A decided to donate two computers to a Hope Elementary School.']