Câu hỏi:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks

Are you a fan of the popular logical puzzle that (1) _____ by the name Sudoku? Even if you’re not, the chances are you know somebody who is. Once (2) _______ known outside Japan, this addictive brain teaser has become a common feature of newspaper puzzle pages all over the world.Sudoku’s great success (3) ______ much to its simplicity. The game (4) _______ for neither mathematical ability nor (5) ________ knowledge and there are just a few sentences of straightforward instructions to read before you can play. The only skill required is the ability to recognize the difference between nine different symbols, and these don’t even have to be numbers.Some clever marketing has helped the game. Western newspapers worked hard at promoting the game. Without this, it is unlikely that it would have (6) ______ off and become quite such a runaway success. The same also (7) ______ from its Japanese name that made people in many parts of the world (8) ______. It as a superior kind of puzzle compared to those you usually find in newspapers and magazines. But the popularity of Sudoku reached a peak in 2006, if the number of (9) ______ on one leading website is anything to go by. Newspapers responded by (10) ______ up with new kinds of logical puzzles, all with simple rules and Japanese names. But for true Sudoku fans, only the real thing will do.