完形填空（共15小题；每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从1-15各题所给的A、B、C和D项中，选出最佳选项。
The British writer Paul Smith has become the first person to travel half-way around the world on
Twitter. Smith, who considers himself as an ordinary person, traveled __l__ for 30 days, relying on the kindness of Twitter __2__. During his journey, he has raised money for “Charity Water”, which helps to br ing clean and __3__ drinking water to developing nations.
