23. ––Was ______ problem solved?––We were trying to think of ______ way out, but it was difficult to find one.
Local villagers ______the doctors with the people ______ in the bus crash.
Time, _____correctly, is money in the bank.
We tried to find a table for seven, but they were all ______.
I don’t know who invented _____ iPhone, but I think it is____ useful invention.
Mr. Li, who _____ his whole life to education, is retiring next month.