完形填空

    Each morning during fifteen- minute bath, I determined to cultivate a b+添加知识点ig, happy smile. I found out it had to be an honest-to-goodness smile from down deep 1 , an outward expression of happiness from within!

        Let's see how the smile muscles 2 me during the day. I would think of the things I had to be 3 for, work up a big smile and then enter. It 4 people when I passed them on the street to give them a 5 smile. Give every living soul you meet the best smile you have 6 smiled in your life, and see how much better you feel and look. It's one of the best ways to 7 worrying, and start living. When I began to do this, I found I became more welcome everywhere.

某地的地理坐标是西经17°，北纬28°，该地位于（ ）

化简分式 $\frac{2a-4}{a^2-4}$÷ $\frac{2a}{a^2+4a+4}$﹣1，并选取一个你认为合适的整数a代入求值．