помогите,напишите правильную букву

1.Mozart died .... thirty-five
a) being age б) when he was в) having г)at the age of
2.The chiidren went to the sports centre .....
a)by bus б)on waling в)by foot г) on foot
3..... is meat.Many people like eating it.
а)loin
б)ham
в)lamb
г)veal