It never occurred to me _____ you could succeed in persuading him to change his mind

__________ does he improve his reading speed— He improves it ________ practicing more.

The Foreign Minister’s Five-day visit to this island country, ______to promote the relationship between them, turned out to be a failure because of their differences about nuclear weapons

Frank thinks math is easy, ______ I think it’s difficult.

Who taught _______ Japanese—I learned it by _______.