It’s no ____ that he seems tired and asleep in class every day.

Is this your bicycle, David? —No, it’s not . It’s Helen’s.

China’s success in manned-space-craft travel shows _________ out country has become one of the greatest powers in space research.

What about going to the movies this weekend? —-I went to the movies last weekend, so I want to do ___ this weekend.

We will never forget what happened_____ the afternoon of May 12, 2008. [ ]