 Complete the following phrase:  After HRT collapsed at the end of the 2012 season, Ma moved to Caterham, continuing the role of Friday test driver whilst racing for their GP2 Series team for the season. In 2013 Chinese Grand Prix, he replaced Charles Pic to participate in the Free Practice 1 and became the first Chinese driver to drive in home Grand Prix session, but he was about 1.5 seconds off the pace to his teammate Giedo van der Garde and out of the 107 reference time to the quickest driver in Free Practice 1. Soon after the 