1．In a library，books and magazines are usually c____________ by subjects.
2．Finally the Red Army finished the world－famous Long March by o____________ countless difficulties.
3．There is no doubt that the 17th National Congress of CPC is of great s____________ to China’ s future.
4．His words c____________ an unfriendly attitude made the people present annoyed.
5．She often c____________ to her boss about her being paid badly.
