at sb's beck and call

at sale at sb's back at sb's bidding at sb's disposal at sb's disposition at sb's expense at sb's feet at sb's insistence at sb's insistent request at sb's service at sb's suggestion at school

tungsten disulfide tungsten filament tungsten fluoride tungsten hexacarbonyl tungsten hexachloride tungsten hexafluoride tungsten iodide tungsten lake tungsten oxybromide tungsten oxychloride