Student or Learner
- I reserved a room ___ Helton (in or at ?)
- buy it ___ expiration date (on or at ? ) (i don't want to say before . I want to buy it on a specific date which is the expiration date)
what about: Do you have a tennis court __ your house ?
( is it in or at or something else?)
Most likely is 'at,' 'in' would be unlikely unless it was a very, very big house.