Don’t let ____ in. I’m too busy to see ____. 

—Do you know the 3G mobile phone will come onto the market soon? —Really? It is said to be superior ______ any other model. I can’t wait to buy ______.

We have various summer camps for your holidays, You can choose ____ based on your own interests.

 I found _________ hard to make myself understood by the old man.

Everyone wants to live in a beautiful, comfortable and “livable” place, but not ______ know where it is.