閱讀填空，從方框中選擇單詞，填入短文空格內(nèi)，使短文意思正確、通順，再將其適當(dāng)形式填入短文后的橫線上。每詞限用一次。

protect， hour， several， hold， call， think， and ， easy， people， probably，

Nowadays you can see many 1. busy on their smart phones (智能手機(jī)) if you look around. Smart phones make our lives much 2. . But have you ever 3. about what they mean to your eyes? Staring(盯) at smart phones for a long time gives you eyes dry 4. even causes a disease 5. glaucoma(青光眼).

While you are not going to stop using them 6.， there are a few things you can do to 7. your eyes. 8. your smart phone at least 30cm away from your eyes when using it. Take a break every 9. and try the following： look at something at least 5 meters away from you and then focus on the tip of your nose. Repeat this 10. times. It could reduce the discomfort in your eyes.

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