--_____ do you visit your grandparents, Jane?

 -- Once a month.

   A. How soon       B. How long      C. How often     D. How far

--______ did you stay in the Marco Polo Hotel?

   --About one week. We enjoyed our stay there.

A. How many     B. How much     C. How often     D. How long

_______ is it from your home to school?    ––Five kilometers.

A. How far                 B. How long             C. How often             D. How many

—Oh, you have a headache and a cough. _______ have you been like this?

—Three days.

—__________ will your father be back?

   —In two months.

  A. How long       B. How soon      C. How often      D. How many