According to the present findings, we can draw a conclusion________so far a large number of people

have died of cholera in this town. [      ]

A. whether 

B. that

C. what  

D. if

I am going to Qingdao and stay there for a week. _____ you are there, would you please

buy some books for me? [ ]

A. If

B. While

C. Since

D. As soon as