Usually E-mail is_________ than long-distance calling．

Have you ever been to London?—Yes, I have been there _______ 2000.[ ]

If farmers trees and forests, giant pandas nowhere to live.[ ]

John ________ the English club in 2012.

What do you think of the EXPO 2010？— It’s great， of course. people are going to Shanghai for the EXPO 2010.