Решение:
Нужно поставить прилагательные в сравнительную степень.
- The Nile is longer (long) than the Colorado.
- Warm weather is nicer (nice) than cold weather!
- Spain is hotter (hot) than Poland.
- Are dogs better (good) pets than cats?
- Are tigers more dangerous (dangerous) than lions?
- Alan is friendlier (friendly) than Bob.
Ответ: 1. longer; 2. nicer; 3. hotter; 4. better; 5. more dangerous; 6. friendlier.