During the summer vacation, Zhang Ming and Fang Hua went to the Children's Palace to study. July 10, Zhang Ming and Fang Hua are both going for the first time. After that, Zhang Ming went every 1 day, and Fang Hua went every four days.

(1). Circle the date when Zhang Ming went to study in July on the calendar. These dates are multiples of (), respectively ().

(2) Draw a horizontal line below the date when Fang Hua went to study. These dates are multiples of (), that is, ().

(3) The date is (), which is the common multiple of () and (). At that time, both of them were in the Children's Palace.

(4) If they still study like this in August, it is inferred that the next study day is August ().

Give the whole family a hundred years old.