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{#blank#}1{#/blank#} (发明) of China?
He's already{#blank#}2{#/blank#} (喂养) his pet dog.
My grandfather is interested in{#blank#}3{#/blank#} (收集) old coins.
The dentist suggests that we should brush{#blank#}4{#/blank#} (牙齿) three times a day.
After the sudden earthquake, most of us were{#blank#}5{#/blank#} (醒着) all the night.
