1) The prisoners planned to _________________ from the prison at night. a) melt b) attempt c) effect d) escape 2) You'll quickly _______________ yourself to student life at university. a) attempt b) adjust c) elevation d) absorb 3) Every year, birds ________________ thousands of miles to their breeding grounds. a) migrate b) migration c) affect d) effect 4) The loss of natural __________________ poses a threat many species. a) productivity b) irrigation c) majority d) habitat 5) Prolonged exposure to heat can cause ice to _________________ into water. a) melt b) escape c) metropolitan areas d) abundance 6) Scientists _________________ the behavior of animals to understand their social structures. a) manual b) irrigation c) infertile d) observe 7) The mountain's ____________________ determines its climate and vegetation. a) habitat b) elevation c) effect d) migration 8) I will ____________________ to answer all your questions. a) migrate b) habitat c) escape d) attempt 9) Plants play a crucial role in the ____________________ of carbon dioxide from the atmosphere. a) absorb b) consume c) absorption d) consumption 10) Deforestation has a negative _______________ on the environment. a) affect b) effect c) abundance d) density 11) Your opinion will not _________________ my decision. a) observe b) affect c) effect d) adjust 12) The _______________ of water in Canada is used for agriculture, at 80%.  a) habitat b) elevation c) coral reef d) majority 13) 750 _________________ workers will lose their jobs as a result of company cutbacks. a) manual b) productivity c) sufficient d) facility 14) Farmers use _____________________ systems to adjust water distribution in the fields. a) irrigation b) majority c) manual d) migration 15) Quality is more important than _________________. a) sufficient b) quantity c) absorption d) escape 16) The _____________ of natural resources in some regions contributes to economic development. a) abundance b) density c) habitat d) coral reef 17) Poor farmers have little choice but to try to grow food in this ________________ soil. a) manual b) irrigation c) infertile d) majority 18) ___________________ investment in education is crucial for the development of skilled workers a) manual b) quantity c) sufficient d) abundance 19) Urbanization is often associated with the _________________ of people to metropolitan areas. a) sufficient b) infertile c) irrigation d) migration

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