see your ticket, please I think you ________ in myseat—Oh, you’re rightMyseat is upstairsI’m terribly sorry

Only when he left home ______ how much he loves his parents. [ ]

Last week, Sam wrote to _____________ boy to tell his life in the middle school.

Xiaogan is well known ________ the culture of “Xiao”.

He finds watching movies ______because the people speak too quickly.