简述中国八大沙漠和四大沙地世界十大沙漠。

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   小题1: day and night. My parents aren’t at home now. They  小题2: to Beijing on business last week. My sister can not look after  小题3:. So I  小题4:  to take care of her. I want to   小题5:  for two days leave.