1、 1. Which one is not the necessary conditions for a valid offer in law? A. A specific person B. A specific place C. A definite content D. The offer is binding upon the offeror

2、（判断题） According to the laws of each country, late acceptance is invalid. However, the CISG may adopt some flexible ways to facilitate the formation of the contract between the two parties.

3、（判断题） An inquiry is the most common form of an invitation to make an offer. It has legal effect and may constitute an offer.