It is difficult for us to learn a lesson in life_____we’ve actually had that lesson.
Weteachersmustseeto________thateverystudentcanunderstand.
Mary has been looking forward in the past 10 years to______the Great Wall.
It won’t be too long before we_____a way to smooth away these difficulties.
Muchashelikedthebook,____hedidn’thaveenoughmoneytobuyit.
Atlasttheygottheletterthey____________.