Can you show me a case ____ the professor mentioned yesterday?
The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.
Misunderstandings arising from lack of social communication, if not ______ properly, may lead to serious problems.
Worldwide markets get tighter and the pain only lasts longer ______ international cooperation is strengthened in no time.
The situation in Haiti after the earthquake was all in a mess, ______ the increasing number of robbery cases.
Measures must be taken before there is another collapse of the coal mine, ______?