--- Why are the students working so hard these days?
---          ready for the coming entrance examination.

21._____by a desire to learn, he was not interested in children’s play and adventure when he was young.

20. The flu is believed________by viruses.

13. – Why does he look so worried?
-- His dad got_________in an accident.

30. The No. 5 subway line, ______in October, 2007, has greatly improved the traffic conditions in Beijing.

26. _____ about what he had done, the shy boy ran away as fast as possible.

  
23. _______ his disability, he did it very well. Please don’t scold him.

22. --- Do you have anything to_____?  
--- No, you can have a rest.

He apologized ________ late.

14. Many businessmen attended the Boao Forum (博鳌论坛) because they knew what _____ from the forum.