Who wants to talk about stuff

Which of the following sentences uses dashes correctly? a. i looked under the bed - get this - and there it was! b. i need - a lot of - colors for this painting. c. i can't believe my own - brother! - is now a mayor. d. tom and i - are planning - a wedding in june.

What is the central idea in this advice from branch rickey to jackie robinson?  

According to the study, what made jonathan swift distrust the assumption most english people of his era made about the superiority of their own race and culture?