根据句意和所给的中文提示，写出句子中的单词。
Could you please tell us about the four great____________(发明) of China?
He’s already____________(喂养) his pet dog.
My grandfather is interested in_____________(收集) old coins.
The dentist suggests that we should brush____________(牙齿) three times a day.
After the sudden earthquake, most of us were ____________(醒着) all the night.