C. Some nouns use the suffixes -ance and -ence. Use the noun form of these words to complete the sentences. Add the correct suffix to each word

Решение:

Добавим суффиксы -ance или -ence к словам, чтобы получились существительные:

• 1. What is the difference between a dolphin and a porpoise? (от слова 'different')
• 2. The fact that apes use tools shows they have great intelligence. (от слова 'intelligent')
• 3. Whales will often give assistance to other whales that are in danger. (от слова 'assist')

Ответ: difference, intelligence, assistance.