One’s attitude towards life     1    (have) a great impact on his or her life quality. Therefore, if you want to live a     2    (good) life, a positive attitude is a must. It is the single biggest thing     3    can make a difference in many aspects. It brings optimism into your life, and makes it easier to avoid worries and negative thinking. If you adopt it as a way of life, it will bring constructive     4    (change) into your life, and make you happier, brighter and more successful. With a positive attitude you see the bright side of life, become optimistic, and expect the best     5    (happen). It is     6    (certain) a state of mind that is well worth developing. A positive mind can help you in many ways. It leads to     7    (happy) and success and can change your whole life. If you look at the bright side of life, your whole life will become     8    (fill) with light. This light affects not only you and the way you look at the world,     9     your environment and the people around you. So, always keep this     10     mind: Life is very much like a mirror; if you smile upon it, it will smile back upon you; if you frown and look doubtful on it, you will get a similar look in return.