$\left(-\frac{7}{8}\right)\times \left(-0.25\right)\times \left(-4\right)\times \left(1+1\frac{1}{7}\right)$=$\left(-\frac{7}{8}\right)\times \left(+1\frac{1}{7}\right)\times \left(-0.25\right)\times \left(-4\right)$这是为了运算简便而使用（　　）

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?21世纪教育网

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.

我国信仰伊斯兰教的民族主要有(    )