根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。
【小题1】I’m so helpful that it's my ______ (please) to help give a seat to somebody in need.
【小题2】The final-exam is coming. The students are ______ (active) revising for tests.
【小题3】Because many factories pour waste water into the river, we must take action to change the______ (pollute) environment.
【小题4】It’s known to all that this trail is the ______ (far) one we have ever walked.

阅读短文，根据短文内容，从短文的五个选项中选出能填入空白处的最佳选项。　有一个选项为多余选项。

         A funny thing happened to my sister Tina last month. She lives in Japan and teaches English. In Japan, people don’t usually wear their outdoor shoes in the house or in school, and a lot of buildings have places for shoes. So her school ahs a special place for shoes.     1.        

         Tina teaches English in the evening. One Friday, she went to school, and she put her shoes in the shoe box—as usual. Then she had an interesting spoken English class with her students.     2.      But to her surprise, her shoes weren’t in the box. There was only one pair of those there, and they weren’t her hoes! She had to get home in a hurry.    3.          

         On Monday, at her next English class, her shoes were in a shopping bag on her desk! There was a note that said, “I’m so sorry. I took your shoes by mistake!”    4.       Somebody felt a lot of shame!

On the first day of school our teacher let us know someone. Looking out, we found an old woman 16 at the door. She said, “Hi, my name is Susan, I’m seventy years old.” While we were  17 what made her take this challenge (挑战) at her age, she said with a smile, “I'm here to meet a rich husband, get  18 , have two children and travel together.” Hearing this, all of us laughed. “In fact,” she went on, “I always    19 of having a college education, and now I’m getting  20 !”
After class we had chocolate and milk together. We became good  21 . I often listened to this “time machine” as she shared her study with me.
At the end of the term we invited Susan to give us a  22 . When she was stepped up to the front, suddenly she found she took the wrong paper. She felt a little frustrated（沮丧的） and said, “I'm sorry. I’m so nervous that I can’t get my ready talk    23 , so I have to tell you  24 I know .”
In her speech she told us, “We don’t stop playing as we are old, we grow old because we stop playing. The secret of staying  25 , being happy and getting success is that we should laugh and find something  26 every day. I think there is a great  27 between growing old and growing up. I am seventy now. If I  28 in bed for one full year and never do anything. I’ll become seventy – one. Since anybody can grow older, my idea is to grow up by always finding the chance in change. Growing older can’t be avoided(避免的), growing up can be  29 . It’s never too late to be all you can be possible.”
During the four years’ study, it was so easy for Susan to make friends  30 she went. In the end, the wonderful woman got a college degree.