Mark Twain worked for several years as a pilot on a steamboat, taking passengers up anddown the Mississippi, the great river ___flows from the north of the US near the Canadianborder.

We’ll reach the sales targets in a month _______ we set at the beginning of the year.

Without facts, we cannot form a worthwhile opinion for we need to have a factual knowledge ________ our thinking.

I’ll never forget the day ________ we worked together

A new study shows older men          a lack of deep sleep are nearly twice as likely to develop high blood pressure.