adjective or adverb?

Put the correct word in each gap.
  1. She worked (hard/hardly) to pass the exam.
  2. She (quick/quickly) crossed the street.
  3. He was (extreme/extremely) (impolite/impolitely).
  4. They haven't seen him (late/lately).
  5. She is very (good/well) at German.
  6. She plays the guitar very (good/well).
  7. They play soccer rather (bad/badly).
  8. Tracy's dress was (extreme/extremely) (expensive/expensively).
  9. She is a very (friendly/in a friendly way) person.
  10. The cake tastes (good/well).