Completar frases Conditional sentences (D)Versión en línea Fill in the gaps with one word por Javier Calera 1 Had not been for the invention of CFCs ( chlorofluorocarbons ) in the 1920s , at least one environmental problem might have been avoided . In fact , they to be invented today , they no doubt be immediately banned . For fifty years , though , if you bought an air conditioner or a spray , there a good chance that it contained CFCs - and those CFCs are still around in the atmosphere . If you able to travel into the upper layers of the atmosphere , you see the chlorine and fluorine from CFCs breaking down the ozone ( a form of oxygen ) . Ozone could damage your lungs you were to breathe it , but high in the atmosphere it performs the function of blocking ultraviolet rays from the sun , rays which can cause skin cancer if you exposed to them . We might have known about the process it not been for the work of two American scientists , Frank Rowland and Mario Molina . A number of industries fought against their conclusions , and might have won the evidence not been so clear . Rowland and Molina received the Nobel Prize for Chemistry in 1995 for their work on the ozone layer , but which we might today be facing an even greater problem . Do the same with these sentences : 1 . I would never be able to afford a new house if wasn't for all the overtime I've been doing . 2 . If it hadn't for the fact that his uncle was a partner in the business , Angus would never have got the job . 3 . How do you think you'd feel if someone happened damage your car like that ? 4 . for the kindness of a complete stranger , I would never have found the hotel . 5 . I don't think I'd be surprised in the slightest Paul were to suddenly announce that he was moving abroad . 6 . Don't forget to mention the new schedule to Veronica if you happen to see her this evening . 7 . Football matches would be ideal family outings it not for the danger of violence . 8 . If it hadn't been the children , I'm sure Trisha would have left Tom a long time ago . 9 . I would have lost the game it not been for some quick thinking . 10 . If you find the book I was asking you about , give me a call .
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