Through thorough investigation, Dr. John Snow was finally able to prove that the outbreak of Cholera _____ people’s drinking of polluted water.[ ]

We can go to Jinan Railway Station by bus.— Why not _______ there for a change

The girl is kind to ________ and she never plays tricks on __________.

I have never imagined the possibility _______ the First Lady Ms Peng is so popular with people in Europe and Africa.

Don’t worry. I’ll in my home for a week.