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据短文内容及首字母提示，填写所缺单词，使短文意思完整。
Think about two people you know. How would you describe their personalities? Are they the s 1 ?
Of course not! Everyone is different. Even identical twins have different personalities. .
Some people are very outgoing(外向的)and friendly. They like to be w 2 other people all the time. Maybe they like to be the centre of attenition. And some people are quiet,maybe even s 3 . They can
be friendly, too. But they like to be alone or with just a f 4 friends.
Some people worry a lot. They may worry about many things , such as their jobs , their families and,
anything that may happen in the future.
H 5 ,some people don't worry about anything ! They n 6 mind what is going on next. These
people are very relaxed.
Some people are hard-working. They always do their b 7 . But some people are lazy. They don't care about d 8___things right or getting things done on time. Hard-working people always get more chances
than those lazy o__9__ in life.
And don't f 10 this:Everyone is different. That means you are special!
1. 2. 3. 4. 5.
6. 7. 8. 9. 10.
，证明：f(x)在(-∞，a)内至少有一个零点．