Long ago I came to the city near my hometown to find a job. I met all kinds of 1 and so I used up all my money soon.

    One day, I 2 a bus quietly at dusk when most people got off work. Suddenly, a 3 cried loudly, “Someone has 4my money!” I felt 5, because his money was in my 6 Some people suggested the bus be 7 to the police station, but some were against it 8 they were in a hurry to go back home. The whole bus was very 9. The driver then 10the bus by the road and turned on the lights to 11 the money. At that time, one passenger said, “Turn off the lights and give the thief a chance to take out the money.” Then the bus got 12When I was still struggling (斗争) in mind whether to take out the money or not, the lights were on again. There was no 13 on the floor. Someone said again, “Give him one more 14” Then the lights were off again. My heart kept beating fast. The lights were on again but they got the 15result. The passengers were in heated discussion again. At that time, someone said again, “Give him the 16 chance!” Suddenly I felt 17and took out all the money when the lights were off again.

    For many years I have felt 18 to the one who gave me three chances to  19 my mistake. When the first and second chances come, you may not be prepared well or don't have enough 20 to act. When the third chance comes you should know clearly what you should do.

人体生命活动中会产生许多废物，这些废物通过排泄和____ 两种方式排出体外．

过上农耕生活的原始居民已经会建造房屋。右图所示，居住在该样式房屋中的原始居民分别是（    ）

设，g（x）是二次函数，若fg（x）的值域是0，+∞），则g（x）的值域是（    ）