The population of many Chinese cities has_________ doubled in the past 30 years

Never before ______ such a wonderful place ______ Qingdao.

Does youruncle still smoke—He ____________given it up It’s two years ever since he ____________

Tony told me a funny story, it made me ______ for a long time.

Thank God you’re safe!—I stepped back, just _______ to avoid the racing car[ ]