1. Some dogs just don’t know _______ fun.

   A. how have                     B. how to have

C. how having            D. how to has

2. Welcome to Bei jing£¡

__________.

A. Thank you.              B.You ,too. 

C. I like it very much.    D.You are kind.

3. Hello£¡       May I speak to Li Lei ?

Sure. __________

    A.Who are you?             B.Who is this ,please?  

C. I am..                  D.He is.