Edison continued his experiment __________ all kinds of difficulties.
Mary’s QQ number must have been stolen by someone else yesterday, _____? Because she asked me to lend her ¥5,000, _____ had never happened before.
_____, the students insist that he _____ separated from his desk mate, who is very naughty.
_____ to get a ticket for the concert, George has been standing in a queue for two hours.
— I’m terribly sorry to have put you to so much trouble.— _____. You didn’t mean to, did you?
She devoted herself entirely _____ helping the children who suffered a lot in the earthquake.