There's no way of knowing why one man makes an important discovery________another man,also intelligent,fails.
Is there a shop around _____ we can buy some toilet articles?
___ smoking here will be fined.
_____ with a good education can apply for the job.
According to the rules, students must not _____ their books during examinations.
She may have missed the train, in _____ case she won't arrive for another hour.