李明陪爷爷取款，旁边有人对李明说：“我急用钱，但我的卡只能转账不能取，你帮我取5000元，之后我就马上转给您！”此时，李明的做法应该是（　）

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.

用同样粗细、同种材料的金属线，制作两个全等的△ABC和△DEF．已知∠B=∠E，若AC边的质量为20千克，则DF边的质量为____ 千克．