---- May I smoke here?--- If you      , choose a seat in the smoking section.

—Is that man Mr Hu?—That ______ be Mr Hu. Because he has gone to Japan with his wife.

The city has changed little in the last        years. 

“Passengers _____ not have their breakfast on the light train”. This rule arouses heated debates in Chongqing.

--Would you like to visit Kun Ming by yourself this summer vocation? --I’m not sure. I _____go there with my parents because of the terrible thing at the railway station.