Ответ:

  1. busy — busier — the busiest
  2. cool — cooler — the coolest
  3. friendly — friendlier — the friendliest
  4. heavy — heavier — the heaviest
  5. nice — nicer — the nicest
  6. noisy — noisier — the noisiest
  7. old — older — the oldest
  8. safe — safer — the safest
  9. small — smaller — the smallest
  10. wet — wetter — the wettest