MY SON STARTED PLAYING TENNIS WHEN HE WAS 10 YEARS OLD.A. AT THE O...

16. - KIEM TRA HOC KI I 11
KIEM TRA HOC KI I 11
16. My son started playing tennis when he was 10 years old.A. At the old of 10 my son started playing tennis. B. At the year of 10 my son started playing tennis.C. At the time of 10 my son started playing tennis. D. At the age of 10 my son started playing tennis.