The number of smokers in China ________increased in recent years, and a number of them _________ the youth. 

 —________ two months enough for the project to be finished?—I am afraid not. The professor is ill and only after he recovers ______ go on with it.

—I called you at 5:00 yesterday afternoon, but no one answered.—Sorry, I with my parents ________ at that time.

________this your guitar?

  When the injured _____ to the hospital , they came to          .