In fact fuels we burn and plant food we eat ______ their chemical energy in the form of heat.

The watch was very good, and he _______ 20 percent down for it.

In China people believe in the saying “out of debt, out of pressure”; however in the west, it is just the ______ — when you are in debt, you are trustworthy and financially capable.

 Computers and mobile phones, though they are indeed making our life ________ and more ________， have reduced the need for face­to­face communications.

(2013·泰安市三模)Barbara often makes a schedule to get herself ________ of what she is to do in the day.