You ____ turn off your computer every night. You could save a lot of electricity. Tom ____ forget to turn off the lights. Last time he went away he left them on for a week. We ____ to call the energy company. I think there's a mistake on our bill. You really ____ drive your car to the store. It's only two blocks away. We ____ stop burning fossil fuels. It's bad for the environment.

Exercise A: Modals of Advice

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