Rearrange the following statements taken from a letter in a correct order: (依次写出数字顺序) 1. ours is a leading travel service organization in Singapore. 2. Before making a decision, we’d like to know how much discount you can offer us. 3. every year we bring over 3000 tourists to Yunnan and Guizhou Provinces in China. 4.I am pleased to tell you that we are considering establishing a long-term co-operation with your hotel. 5. We believe that we will be able to co-operate well.