_____ 2/ _____ 3/ _____ 4/ _____ 5/ _____ 6/ _____ (23-28) CHOOSE THE WORD OR PHRASE THAT BEST FITS THE BLANK SPACE IN THE FOLLOWING PASSAGE

1/ _____ 2/ _____ 3/ _____ 4/ _____ 5/ _____ 6/ _____

(23-28) Choose the word or phrase that best fits the blank space in the following passage:

Air pollution is a (23)___________ of ill health in human beings. In a lot of countries there

are laws limiting the amount of smoke (24) ________ factories increasingly produce. Although

there isn’t (25) ___________ information on the amount of smoke in the atmosphere, doctors

have (26) ________ that air pollution causes lung diseases. Poisonous gases from the exhaust of

cars have (27) _________ increased air pollution in most city. The lead in petrol produces a

poisonous gas which often (28) __________ in busy streets surrounded by high buildings.