The best way to improve English is to join ( an / the / our ) English club.
如不指明那个英语乐部, 请用 an,
如指明那个英语乐部, 请用 the,
如是作为贵号的招徕, 请用 our
英语习惯先讲结果, 再加描述. 所以句式中我将主客对调了
Joining the English club is the best way to improve English.
Joining an English club is the best way to improve English.
It is the best for you to join English club where you will improve your English .
3楼的"exile1026" s翻译的是很不错的。