6. He is quite clever a boy though he looks s________.

5. Computers are used to c____________ with each other around the world by the Internet.

4. I think we can work together to c_________ an even better system.

3. The 21^st century is the century of information t____________.

2. P____________, I think the team who won first place cheated..

1．A computer can solve many m____________ problems.

40. A. thank　　　　　　　　　　 B. praise　 　　　　　　　　 C. leave 　　　　　　　　　 D. fool