Read the following text and fill in each gap with a suitable word based on the information of the text.

Air pollution comes from a wide variety of sources. In Bangladesh, poisonous exhausts from Industrial plants, brick kilns, old or poorly-serviced vehicles and dust from roads and construction sites are some of the major sources of air pollution. We can reduce this type of pollution by making less use of motor vehicles and avoiding the use of vehicles older than 20 years. We may also use proper lubricants to lessen the level of emission and pollutants. We can encourage people to use Compressed Natural Gas (CNG) or Liquid Petroleum Gas (LPG) for fuelling their cars. The government may relocate hazardous industries like brick kilns to areas away from human habitations.

Air is the most important (a) ---- of human environment. Man cannot (b) ---- a single moment (c) ---- air. But we do not (d) ---- that it is we who (e) ---- this most vital element. For the (f) ---- of air pollution we should avoid the use of vehicles (g) ---- than 20 years. People can be (h) ---- use CNG or LPG for fuelling their (i) ----. Thus, air pollution can be (j) ----  to to some extent.