根据汉语提示完成句子，每空一词。

1．这两朵花都很好看。

     _____ flowers are very beautiful.

2．不论是老师还是学生都没能做出那道数学题。 

      _____ the teacher _____ the students can work out the maths problem.

3．他让儿子在家受教育而不是送他去学校。    

    He educated his son at home _____  _____  _____  him to school.

4．据估计有两千多人在玉树地震中遇难。 

     It _____ ______  that there are more than two thousand  people died in Yushu earthquake.

5．要么我，要么玛丽每天打扫教室卫生。 

     _____  Mary _____ I _____ the classroom every day.

属于我国发现的立克次体病的是（）

A.伤寒

B.流行性斑疹伤寒

C.黑热病

D.恙虫病

E.地方性斑疹伤寒