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which; / that; that that; which which; that
was discouraged was enforced by law was prohibited by law was introduced
People who are allergic to animal fat. People who have certain kinds of heart disease. People who are overweight. People who are too thin.
to decide; to lead deciding; to lead to decide; of leading deciding; of leading
not be changed be changed should not be changed should be changed
has won gets the highest takes a lead takes the lead
Poor combustion High cylinder oil consumption Leaking exhaust valves All of the above
faulty combustion excessive ring temperature over lubrication all of the above
Lead and aluminium. Rare-earth metal and coal. Zinc and tin. Not indicated directly.
Hunters shoot condors. Puppet rearing practices have caused it. Hunter's bullets contain lead which poisons the meat condors eat. They never used to like lead.
the use of a poor quality oil the deterioration of its properties the formation of deposits the reduction in heat transfer ability
immediately eventually increasingly occasionally
By analyzing the data published in journals like Nature and Ambio. By observing the lead accumulations in different parts of the arctic area. By studying the chemical elements of soil and snow in Northeastern America. By comparing the chemical compositions of leaded gasoline used in various countries.
The oil oxidizes and forms carbon deposits The viscosity increases Engine oil consumption decreases Lubricating qualities of the oil are enhanced
forests get rid of lead pollution faster than expected lead accumulations in forests are more difficult to deal with lead deposits are widely distributed in the forests of the US the upper layers of soil in forests are easily polluted by lead emissions
are puzzled by the mystery of forest pollution feel relieved by the use of unleaded gasoline still consider lead pollution a problem lack sufficient means to combat lead pollution
the Clean Air Act has not produced the desired results lead deposits in arctic snow are on the increase lead will stay in soil and snow longer than expected the US is the major source of lead pollution in arctic snow
coke deposits cylinder water temperature asphalt in fuel oil lub oil
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