Do you think Li Hua has passed the English examination?— No, If so, he ______ us yesterday.

Who is the boy over there under the tree- He’s Li Ming, _______ leader of_______ university football team.

Some scientists believe that ________ is no doubt ________ a cure for AIDS will be found.

Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.

Do you know the UK is _______ four different countries