_______(为什么) John failed the driving test after he had practiced so long?
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I hope the child can __________ (举止得体) at school.
It is very cold, which seems __________ for late spring.
Some people think black cats and the number 13 are __________(不吉利;不幸的).
It is __________ (不公平)that some job opportunities are only open for men.