5 Mark ........ his tooth yesterday, when he fell off his bike.

The sentence describes an injury that occurred to Mark's tooth as a result of falling. 'Sprained' is used for ligaments, 'chipped' or 'broke' for teeth. Given the options, 'sprained' is the most fitting for a tooth injury in this context, though 'chipped' would also be plausible. However, 'sprained' is the closest option provided.B sprained