... phương án A, B, C, hoặc D tương Đề thi chon học sinh giỏi môn Tiếng Anh lớp 12 section a: Grammar & Vocabulary (4 0 điểm) Part I. (2 5 điểm) /Hãy chọn một đáp án đúng nhất trong các ... units. It can also be difficult to know the (4 9) of something compared with other goods. (5 0) historians, the first money, in the sense we (5 1) it today, (5 2) of good coins produced about2,500 ... difficult to imazine how peole (4 3) without money. In the earliest periods of human history, people used to exchange things they had (4 4) of for things that they were in (4 5) of. For example, they...