To my great joy．I got a chance to take a photo with Andy after the vocal concert, which I _____forward to for years．

It _____ about twenty years since CCTV ____ to broadcast English programs.

--Growing population resulted in growing rubbish. --There is possibility that rubbish ________the major threat to human beings.

 Over the past decades, the population in this country      because of the rising birth rate, immigration and the declining death rate.

 Many policemen and soldiers are ______ the forest _____ the prisoner escaping from prison.