The man who came to help us is a friend of ()

多项选择题You should have been more patient () that customer; I'm sure that selling him the watch was a possibility.

A. of
B. with
C. for
D. at

多项选择题In the poorest nations of the world, more than half of the population()on farms

A. have lived              
B. live
C. are living               
D. lives