What will be the most appropriate word from the options given for 4 ?

At that time the Rashtrapati Bhavan was a serene as a resort hotel out of season. The corridors were ______1________. In the various offices, _____2_______ gray men in waistcoats talked to one another in low-pitched voices. The only color, or choler, curiosity enough, was provided by President Kalam himself. Apparently, his _____3_____ was easily set off, he scowled when he ____4____ the corridors.