You may think that you’re safe little home is much better for you than the big wide world, but it’s not so. Many studies suggest that the concentration of some pollutants is often two-to-five times—and sometimes more than 100 times—higher indoors than outdoors. This is why you should not spend all your day staying indoors. You should go outside a little bit (1) you are exposed to outdoor air. Also, being outdoor can probably prevent you from experiencing vitamin D deficiency. Sun is known as the best source of vitamin D. You should get some sun exposure. (2), you will have enough vitamin D in your bone. The most appropriate connective word to complete number 1 is ….

Question

You may think that you’re safe little home is much better for you than the big wide world, but it’s not so. Many studies suggest that the concentration of some pollutants is often two-to-five times—and sometimes more than 100 times—higher indoors than outdoors. This is why you should not spend all your day staying indoors. You should go outside a little bit (1)____ you are exposed to outdoor air. Also, being outdoor can probably prevent you from experiencing vitamin D deficiency. Sun is known as the best source of vitamin D. You should get some sun exposure. (2)____, you will have enough vitamin D in your bone.

The most appropriate connective word to complete number 1 is ….

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