综合填空：根据短文大意选择方框内的单词，并用其正确的形式填入空白处(每空填一词) ，使补全后的短文意思通顺，语法正确，结构完整。

herself     go  have   ask  cough

My little sister is ill. She    day and night. My parents aren’t at home now. They   to Beijing on business last week. My sister can not look after  . So I    to take care of her. I want to     for two days leave.