The girl can dance as well as the boy ____.Adoes B could C can D do

题目

The girl can dance as well as the boy ____.A\does B could C can D do
Our new manager is very easy to _____ A get on B get on with
I really don't know ____ next .---- What's wrong Can i help you
I don't know ____cost it is (who)
哥哥姐姐们 都是为什么

答案

B
what to do/how to do it
whose cost应是名词