用适当介词填空.he told me that he came here___a special purpose but he didn't want me to know.
people in the past didn't know that our earth is shaped___a ball.
in that company there is a first-class testing centre provided___their employees.
he was asked to take part in the sports meet in place___jim,who caught a cold.
he gets up late every morning,so he always goes to school___a hurry.