The more efficient a device is, the greater the percentage of usable energy it produces.  A very efficient pair of solar panels will produce little energy or a lot of energy?
a lot of energy
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Water becomes more dense when it is colder and when it has more salt.  Water found on Earth's hot regions is more or less dense that water found on Earth's cold regions?
less
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The greater the objects mass, the greater the force of attraction; in addition, the greater the distance between objects, the smaller the force of attraction.  Jeffrey subtracted more and more dough to the recipe. As he subtracts more, the force of attraction the dough is capable of increases or decreases?
decreases
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The faster, longer, and farther the wind blows, the bigger the waves are.  Dan is on a ship, and sees that the waves are getting small! Dan can deduce that it means that the wind is blowing harder or softer?
softer
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