A good sunscreen helps to block the harmful UVA and UVB rays of the sun. Each one has a sun protection factor (SPF) that is equal to the amount of time you can stay in the sun without (21) ____. Very pale-skinned people burn (22)  _____so they should use a

A good sunscreen helps to block the harmful UVA and UVB rays of the sun. Each one has a sun protection factor (SPF) that is equal to the amount of time you can stay in the sun without (21) ____. Very pale-skinned people burn (22)  _____so they should use a very high SPF or a total sunblock. Wear sunscreen with an SPF of at least 15 every day. You should even ____(23)___it on cloudy days and when you don't plan on spending much time outdoors. If you are going to be outside for a while, apply sun protection every two hours and reapply it after swimming. If in direct sun, wear a sunscreen with a higher SPF, like SPF 30. Sunscreens help;___(24)___, they are not thr complete answer to the problem. As the sun's rays are strongest between 10:00 a.m. and 4.00 p.m., you should avoid spending a lot of time outside during this period. And wear long-sleeved shirts, long pants or skirts, a sunhat with a brim and sunglasses - these all help to ___(25)___they are not the complete you safe from the sun. easily               difficultly  keep           however          burning             wear