He was sitting at the piano an old song. C A sing B sings C singing D sang​

С, т.к он пел в настоящем временем(окончание ing)

dear alex 

  how are the things going on? did something new happen in your life? having   received your letter, i wanted to answer it immediately. but i was working a lot during the last two weeks. so i was pressed for time and did not manage to carry out my intentions.

i spend 1: 00 watching tv each day.i watch it for entertainment because in my spare time i'm bored.i do not like to watch a program house 2.

and what programs do you watch? why do you watch them? when you watch them?

  your very sincere friend,neumann