根据短文内容选择可以填入空白处的最佳答案。(Choose the best answers to complete the passage．)
We sometimes call the lion“the king of the jungle(丛林)”because it is stronger and more dangerous than other animals．It can 1 faster than many animals and it can hunt(捕猎)the beast．It is the highest animal in the 2 food chain(食物链)．
In the sea, the shark is one of the animals at the 3 of the food chain．It can swim faster than 4 other sea animals, and it can use its big teeth to eat them．
What is at the top of the world's food chain? 5 are! We are not the biggest or fastest, but we are the 6 ．We could not run faster than cheetahs(猎豹), so we 7 cars and now we can move the fastest．We could not 8 better than lions, so we invented guns(枪)．Now we can hunt the beast．
People's inventions are clever, but they can be 9 , too．For example, people invented 10 , and now they make the air and rivers dirty．This can make 11 changes．Dirty rivers kill fish． 12 bears cannot eat the fish and the bears die．If we kill one part of the food chain, 13 also die．Remember that we are a part of the food chain, 14 we are in danger too! If we protect animals, we are protecting 15 !We should and we could do something for the world!
One evening, three old men came to a house and knocked at the door．The hostess(女主人)opened the door．1 she didn’t know them, she asked them to 2 and have something to eat because she thought they must be 3 ．To the woman’s surprise, they were not 4 to come into the house together．One of them explained,“We are called Wealth(财富), Success and Love．You have to choose 5 of us．”“Go in and discuss with your 6 which of us you want in your home ,”added another old man．
The woman told the family 7 had happened．Her husband advised inviting Wealth．He hoped their house would be filled with 8 ．But the woman 9 Success．Their daughter was 10 from one corner of the house．She jumped in with her own suggestion,“It would be 11 if we invited Love．Our house will then be full of love!”
“
Let’s listen to our daughter．”The husband finally made the 12 ．The woman went out and asked the three old men,“Which one of you is Love?Please come in and be our guest(客人)．”
Love 13 and started walking towards the door．The other two 14 ．Surprised, the woman asked,“I 15 invited Love, why are you coming in?”
The old men replied together,“Wherever Love goes, we go with him．Wherever there is Love, there is also Wealth and Success!”
A few years ago when my daughter was about two years old, I went through a difficult time．My husband left us and I didn't have 1 money．I think I was also 2 disappointed but I had to take care of my daughter．
One day I thought I would take my 3 to a park as she liked to play there and I thought it was a nice thing to do．I decided to 4 there because the bus was expensive, so it 5 us a long time to get there．When we finally 6 , my daughter immediately began to 7 ．She was cold and thirsty and wanted to go home．I didn't even have any money to buy a drink 8 to take the bus back home．I was so 9 because my dream of a nice time had fallen apart．
I started walking back home, and my daughter would not stop crying．I felt so unhappy and angry with 10 and my life that I started crying, 11 ．
At that point a car stopped beside us and a gentleman offered us a lift．He took us home, and seemed really 12 -he even offered me all his change! The kindness of this stranger really made me feel 13 better．I never saw him again and I don't know who he is but he really 14 that day．Now my life is better and my daughter has 15 ．I always tell her that story．Maybe she doesn't remember that day now, but she has been moved by that stranger．