Liu Xiang has announced the end of his sporting career.— . But I think he is still one of the greatest athletes in China.

My cousin Mary was born ______ a singing voice.

Have you finished your work yet–Yes, I have . It ____________ half anhour ago.

Developing science and technology must ____ peoplerather than harm them．

Do you know the young boy________ is reciting a Tang poem over there — Yes. He’s a friend of________ .