IV.  Fill in each blank with one appropriate preposition.

Ask most people what is happening (1) __________ the world‘s population and they are likely to say it is exploding. Ask them if there will be enough food next century and they will say no. Ask them (2) _________ the world‘s energy supplies and they will say they are running (3) __________ and we will all be sitting in the dark and cold next century. Ask them what they think (4) ___________ raw materials and they will say we are using them up (5) __________ a rate that will mean there are none left (6) ________ our grandchildren.

These statements have two things (7) ________ common. They are too gloomy, if not about this century then the next. And they are all wrong. Or so it is persuasively argued (8) ________ a book that tries to chart our future over the next quarter century. Most of the attention the book has received so far has concentrated (9) ________ its forecasts for Britain and the prospect (10) ___________ five million unemployed.

Ask most people what is happening (1) __________ the world‘s population and they are likely to say it is exploding.