English or Not English?

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Across
  1. 7. A Latin word used in English meaning both 'the contrary' and 'both ways'
  2. 8. Examples that verbs used to be conjugated like in Latin
  3. 9. A notorious food in the US that however carries the name of it's true place of origin
  4. 10. The root language from which English originates
Down
  1. 1. A sauce that's normally paired with french fries, hot-dog, and hamburgers
  2. 2. The leisure activity of observing wild animals in their natural environment
  3. 3. A modern currency with Czech origins
  4. 4. Where you can safely leave your vehicle
  5. 5. A scientific subject of Greek etymology and non-germanic pronunciation
  6. 6. A famous non-flying bird which etymology literally means "white head"