A. Listen to some sentences and fill in the blanks with the missing words. 1. Many researchers now 1____ that it does 2____ both your 3_____ and your 4____ . 2. 5 people especially 6 this vitamin to 7_____ their 8 . 3. These people find that they 9 , have 10______ , and often 11_____ in the 12 months. 4. 13_____ lights 14 more accurately the 15 of 16______ . 5. If you spend a lot of time in 17___ light or indoors, you should try to spend more time 18_____.