As we grow older, birthdays seem to more quickly than when we were children.
It was ______the boy said he almost never did any exercise in the school______ the mother began to worry about his health.
It was in the factory _________ his friend worked _______ he picked up a lot of experience.
Was it _____ he was training in the field _____ he got hurt?
----______was it ______ they discovered the entrance to the underground palace? ----Totally by chance.
I think it’s the driver rather than the passengers who______ for the accident.