The Chinese river dolphin is one of the First-Grade State Protection animals, a (an) mammal with its name – water panda.

With the popularity of network, email has largely ________ the traditional letter.

What was your brother doing at this time yesterday– He was reading a magazine ________ I was writing an e-mail at home.

I live in a flat 15 miles _______ London.

It’s very important _______ us ______ every day.