I don't know ________．

1. A.
   where can we buy the tickets
2. B.
   how much it costs to fly to Hainan
3. C.
   what is he waiting for
4. D.
   why was he late for school this morning

閱讀下面短文，簡要回答所給問題。
The first telephone cards, produced in 1976, were Italian. Five years later the first British card appeared, and now you can buy cards in more than a hundred countries. People usually start collecting cards because they are small and light and you do not need much space for them. It is also a cheap hobby for beginners, although for some people it becomes a serious business. In Paris, for example, there is a market where you can only buy telephone cards, and some cards cost up to ￡4,000. The first Japanese card has a value of about ￡28,000. Most people only see cards with prices like these in their collectors’ magazine.
【小題1】When were the first Italian telephone cards produced?  _________________________________________________
【小題2】How many countries can produce telephone cards now?  _________________________________________________
【小題3】Where can we find a market to buy telephone cards?
_________________________________________________
【小題4】What is the price of the first Japanese telephone card?
_________________________________________________
【小題5】In which magazine do most people see cards with prices?
_________________________________________________