Multistate things i don't know

Multistates: did 12/20 right on 4.2.2006
1.        If an event was not foreseeable to the parties at the time a contract was formed makes performance of the contract impossible, such performance is excused.
2.        Quasi-contractual remedies are designed to prevent unjust enrichment, thusly, they are unavailable to the non-breaching party who has received no benefit from P's work.
3.        Acceptance of goods occurs only after the buyer has had a reasonable opportunity to inspect the goods and either notifies the seller of his intention to keep them or fails to reject them.
4.        An offer for a unilateral contract cannot effectively be withdrawn once the offeree has begun performance.
5.        If a promise not to assign a contract is enforceable, it is like any other promise in the damages may be available as a remedy for its breach.
6.        Quantum meruit is available to prevent unjust enrichment only where services were rendered under circumstances such that the party for whom payment is sought was aware of the other party's expectation of payment.
7.        Frustration of purpose may excuse performance of a contract when an unforeseen event destroys its underlying purpose, but only if both parties knew what that purpose was.
8.        SOF requires a contract for the sale of goods with a price of $500 or more to be in writing, but does not apply to a contract for services, even if goods are to be provided by the person performing the services.