I think the result must him very much.

Do you know when she____ back–Sorry， I don’t know. I’ll call you when she ____ back.

_____ your advice, I’m sure to consider it and give you reply in time[ ]

If you ________ smoke, please go outside.[ ]

South Korean rapper PSY’s hit song Gangnam Style made history on December 20 as first-ever video on youtube. com to reach 1 billion views.