1. INTRODUCTION  
2. SAMPLES AND OBSERVATIONS  
2.1. The Sample  
2.2. Observations  
3. RESULTS AND ANALYSIS  
3.1. Detection Rate  
3.2. Line Width  
3.3. SiO Luminosity  
3.4. SiO Column Density  
3.5. Gas Mass and \(H_2\) Column Density  
3.6. Bolometric Luminosity to Mass Ratio  
4. DISCUSSIONS  
4.1. Uncertainties of the Results  
4.2. Variations of SiO Line Widths with Evolution  
4.3. Variations of SiO Luminosity and Abundance with Evolution  
5. SUMMARY