51.
My uncle is . . . . . . . . S. D. O.

52.
Sir, please give me . . . . . . . . orange you have just brought.

53.
I have sent . . . . . . . . s. m. s.

55.
She has . . . . . . . . very nice cat.

56.
My aunt lived on . . . . . . . . ground floor of . . . . . . . . old house on . . . . . . . . River Thames.

57.
Subhranil went to . . . . . . . . United States to spend the holidays.

58.
This is . . . . . . . . book.

59.
Draupadi Murmu is . . . . . . . . President of India.

60.
Do not leave your friends in . . . . . . . . lurch because . . . . . . . . friend in need is . . . . . . . . friend indeed.