Переделайте предложения, используя модальные глаглы «must», «should», «oughtto». 1 Do not stare at the screen for long periods of time. 2 Avoid placing the monitor so that it reflects bright light, such as a Window. 3 Keep the screen clean to prevent distorting shadows. 4 If you work in an office with a large number of computers, don’t sit too close to the sides orbacks of the monitors. 5 Buy a protective filter that cuts down the Extremely Low Frequency emissions.