用适当的介词或副词完成句子。
________ everything bought, he went home．
________ a student, observing the rules is important．
________ touching letters, the blind can read．
It is impossible ________ us to touch the exhibits in the showcase．
________ the darkness, you can't make out anything．
While you are walking on the street these days, watch out ________ your mobile phone．
These boys are wild ________ joy at the news．
People here main feed ________ rice．
We all wished ________ a chance to take a spaceship to fly to the sky one day in the future．
The time we are making ________ is related ________ your final grades．