Verbs Exercise

 Fill in the blanks with an appropriate verb form.

Sugary drinks …………………… (boost / are boosting / boosts) your energy levels. Someday, sugar …………………………. (might / can /should) power your electronic equipment as well. Scientists ……………………………. (have found / are finding / found) a way to turn sugar into electricity.

 The fuel cells that are currently used ………………………… (depend / depends / are depending) on precious metals, such as platinum, to spark chemical reactions that ……………………… (produce / are producing / produced) electric currents. The new strategy …………………………. (involve / involves / is involving) fuel cells that use a type of protein called enzymes in place of the metals. In the cells of living things, including people, enzymes ………………………….. (is / are / have) what spark chemical reactions. To keep up the pace that our bodies ………………………….. (demand / demanded / are demanding), our cells constantly ………………………. (produce / produced / are producing) new enzymes as the old ones break down.

Answers

Sugary drinks boost your energy levels. Someday, sugar might power your electronic equipment as well. Scientists have found a way to turn sugar into electricity.

The fuel cells that are currently used depend on precious metals, such as platinum, to spark chemical reactions that produce electric currents. The new strategy involves fuel cells that use a type of protein called enzymes in place of the metals. In the cells of living things, including people, enzymes are what spark chemical reactions. To keep up the pace that our bodies demand, our cells constantly produce new enzymes as the old ones break down.