Tom and Mike are good friends. _____ often help each others.
I’m a football fan. I was interested in everything _____is about the 2010 World Cup.
Where would you like to go ______ vacation? [ ]
Do your two children live in Beijing with you?— _______. One is in Shanghai, the other is in Tianjin.
I don’t know if he ____. — He’ll come if it ___.