根据短文内容理解，选择正确单词，并用其适当的形式填空。
success, luck, friend, none, to, number, look, failure, other, if, nobody, into |
What's the most important thing for you to have in your life? Somebody mentions hardwork, ____ suggest knowledge, love and luck. If you arrange (排列) the 26 English letters in order and use ____ to represent each of them, for example, 1 for a, 2 for b, 3 for c…… 26 for z, you can change an English word ____ a number. So hardwork becomes 8+1+18+4+23+15+18+11=98, meaning 98 is its mark. Knowledge: 11+ 14+ 15+ 23+ 12+ 5+ 4 + 7+ 5=96, love: 12+15+22+5=54, and ____: 12+21+3+11=47, a small mark. ____ of these words can give one a full mark. What about money? It can't, either.
Then what else? Don't be worried. You can always find an answer ____a problem in your life, when you change your way of ____ at things or doing things, or your attitude(态度). Yes, attitude is the word. See for yourself: attitude: 1+20+20+9+20+21+4+5=100, a full mark. Different attitudes lead to different courses of life. Most time people hope for a better life. It is possible that they will have a better life ____ they change their attitudes. When you change your manner and become ____ towards others, you'll meet more smiling faces towards you. In the same way, if you take a positive attitude towards ____, you'll find it's also rewarding(有益的) though it has caused you losses(损失).
=｛4，5，7，9｝，
=｛3，4，7，8，9｝，全集
，则集合
中的元素共有( )
