根据短文内容，在空格处填入一个适当的词，使短文意思完整。

    Why do people drink? Often because they are 1           , but this can't be the 2            reason. There

 3             be other reasons, too. In many countries, when friends see each other, they often have a

drink 4            they sit and talk. Many English people don't need anyone 5          , they drink tea several

times 6            day even if they are alone.

    In most countries people say something interesting when they drink 7           . The English often say

cheer. In the countries there are many places (cafes, bars) where they 8            drinks. 9            there

are so many drink places, it seems that many people drink more often than they really 10            it.

_____ computer is the most important invention of _____ twentieth century. [ ]

A. A; the

B. The; the

C. The; 不填

D. A; 不填