Each time tourists travel to Beijing, they     the Forbidden city.

Why not come over at the weekend? My family    seeing you again.

－I remember you were a talented pianist at college. Can you play the piano for me?
－Sorry, I       the piano for years.
A. don’t play                B. wasn’t playing          C. haven’t played

A survey of the opinions of experts           that three hours of outdoor exercise a week is good for one’s health.
A. show                      B. shows                C. is shown

Mary will go to Sydney if she      a five-day trip.

We must work hard. There _______an important exam in June.

I can’t understand what the book is about because it              in French．

一Yesterday all the classmates went to the museum except you．What was wrong?
一I              in the hospital looking after my grandfather．

—Where’s your brother，Jane?
—He’s not in Chongqing these days．He           Beijing．

---- Look at the sign on the right.  
---- Oh, smoking ____ here.  
A. doesn’t allow   
B. isn’t allowed    
C. didn’t allow