Passage 4: Questions 33-37 Disposing of waste has huge environmental impacts and can cause serious problems. In manycountries around the world, much is buried in landfill sites. Some waste will eventually rot, but not all, andin the process it may smell, or generate methane gas, which is explosive and(33)the greenhouseeffect. Leachate (34) as waste decomposes may cause pollution. Badly-managed Iandfill sitesmay attract vermin or cause litter. A prionity is to move from reliance on waste dumps that offer no environmental protection, to wastemanagement systems that (35)useful resources within the economy. Waste (36)at sourceand use of specialized waste processing facilities to separate recyclable materials has a key role. Disposalof residual waste after extraction of material resources (37)engineered landfill sites and/orinvestment in waste-to-energy facilities.
33.
(A) hinges on
(B) wears out
(C) looks into
(D) contributes to