VIII. Open the brackets and use the adjective and the adverb in the comparative form. 1. Your test isn't good. You can do it better (well) than you did. 2. Who can solve this problem the quickest (quickly)? 3. Taking the bus is cheaper (cheap) than taking the car.

Решение:

Сравниваем предметы или действия, используя сравнительную степень прилагательных и наречий:

1. Your test isn't good. You can do it better (well) than you did. (Сравнительная степень наречия 'well' — 'better').
2. Who can solve this problem the quickest (quickly)? (Превосходная степень наречия 'quickly' — 'quickest', так как используется с 'the').
3. Taking the bus is cheaper (cheap) than taking the car. (Сравнительная степень прилагательного 'cheap' — 'cheaper').

Ответ: 1. better; 2. quickest; 3. cheaper.