The farm as well as its neighbouring hills we once spent so much time _____ on a new look as recently as last year.  

24．The teacher together with the students ________ discussing Reading Skills that _______ newly published in America.

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

 Playing football and watching TV _____ both interesting. 

 —________ 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.