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1 . In many countries, primary education is free and ________ for children of 6 to 12 years, and it is illegal for parents to prevent their children from attending school.
| A．compulsory | B．complicated | C．conservative | D．convenient |
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2 . Many companies make it ________ for job applicants to pass a medical examination before they are allowed to work.
| A．compulsory | B．comprehensive | C．controversial | D．contradictory |
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3 . It is wise to carry a warning triangle as its use is ________ after an accident or breakdown in most countries.
| A．conditional | B．controversial | C．confidential | D．compulsory |
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