l found_____important to master a foreign language.

l found_____important to master a foreign language. 16.To master a foreign language,______ . To master a foreign language,______. To master a foreign language,______. A．a lot of practice is It is difficult for a foreign language beginner to master a I don't think ( )possible to master a foreign language witho I think that it is important to master a foreign language.(同 I don't think it possible to master a foreign language witho I think that it is important to master a foreign language.(改 I don’t think possible to master a foreign language _______ I think that it is important to master a foreign language.（同 To master a foreign language one must work hard at it.