People are using more and more natural gas, wind and other forms of _____.

—He was downloading reading materials from a website when the computer crashed.—_______ that he looked a little upset.

When you decide to start a family, you make a/an ______ to them. You shouldn’t turn your back on the people who love you.

Many kinds of birds fly south at the ______ of winter.

He is out of work now but he gets a good _____ from his investment.