The instructor and student had completed instrument instruction and afterwards, the student, who was a private pilot, requested and they practiced crosswind landings. According to the instructor 'I was distracted by his perfomance and remiss in verification of fuel status in execution of before landing checklist. Power was lost on climbout. Additional check futile. Committed to off-field landing. Damage occurred on rollout through a ditch in terrain.' The FAA examined the airplane and revealed the left fuel tank was empty. An undetermined amount of fuel was in the right tank.