Word puzzle

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Across
  1. 4. If we _______, we reduce the speed(速度).
  2. 5. we can see a film at the ________.
  3. 7. At the ________,doctors can help us
Down
  1. 1. At ________,we can buy a postcard
  2. 2. subjects like Chinese,English,math
  3. 3. At ________,we can buy a book
  4. 4. ______ is an underground(地下) railway/railroad system in a city
  5. 6. At the _________,we can learn about history(历史)