填空题

The shape of heart, composed of interweaved hearts, signifies that volunteers, athletes, the Olympic family, and all guests would render service and compassion in a joint effort to glorify the Olympic Movement.
The shape of a dancing human stands for volunteers with dedicated spirit. The sincere smiles, outstanding services, and friendly actions of the volunteers will evoke a strong echo in every participant of the Olympics.
Chinese unique artistic form -- calligraphic art is adopted in the beaming design of the secondary mark, which sets off against the Olympic Emblem "Chinese Seal, Dancing Beijing.\

What shall Volunteers provide for every participant of the Olympics
The sincere smile, outstanding service, and （）.