Choose the best answer A, B, C or D to complete these sentences

Choose the best answer A, B, C or D to complete these sentences. 

1. How old……? She is thirty years old.

A. she is                     B. she’s                      C. is she                     D. is he

2. How many…………..are there in your family?

A. child                      B. childs                    C. childrens               D. children

3. My mother smiled…………at the joke.

A. quietly                  B. loudly                    C. strongly                 D. widely