Put the past form of these verbs into the text. Be careful: some are regular but others are irregular!
The Highland Games (exist) in Scotland in the 11th century. Some believe that King Malcolm III (organize) a foot race that (become) the start of the Games. Others believe the Games (begin) even before that.
Regular verbs: V + -ed
Irregular verbs: be → was / were begin → began become → became do → did