用适当的介词填空
（1）The Hope Project has built many schools ____ big classrooms and libraries.
（2）Paris is ____ the largest cities in the world.
（3）I regard you ____ my best friend.
（4）No one can be successful ____ hard work.
（5）Did you see an old tree across ____ the old house?
（6）We can't pass the exam ____we study hard.
（7）Could you tell me something interesting ____ the old man?
（8）The young girl has been to ten countries ____ five years ago.
