We want to know whether the drug has an effect _______________ people’s health

If the south had won the war, what is now the United States _____ divided into several countries.

Little children ask endless questions because they are ______ about everything.

Viewers will have ____ second chance to seeSaturday’s concert on ____ Channel 4 tonight.

Mr. Wang’s never been to Canada, has he—. He went thereon business last week.