2 . They want to do r_________ to find out which is the most popular place for travellers.

4 . 阅读下面短文，在空白处填入适当的单词，单词的第一个字母已给出。
       Alex and his friend Claudia were on their way to the library. When they passed by Greenwood Park, the swings (秋千) brought back m    1     of their childhood spent there. But now everything looked so old and dirty. Rubbish l    2     on the ground next to an overturned rubbish bin. A little boy there told them that the city took the other rubbish bins away and the remaining one never got emptied (空的) often.
       In the library, they came across Mrs. Allen, their kind teacher. She e    3     them to go to the City Hall to voice their thoughts. The next day, Claudia and Alex went to the City Hall but met an impatient officer. He explained that the city couldn’t help with their problem d    4     to lack of money. Sadly, they left and turned to Mrs. Allen for help. Under her guide, they decided to ask Go Green, an organization which wants to protect the e    5     for help. She promised to fix up a meeting for them to present their ideas to Go Green. Hearing this, their face l    6     up.
       Two main jobs remained ahead: r    7     ways to clean up the park and preparing a good presentation (演示). Claudia was good at discovering new facts and information w    8     Alex always had a talent for speaking. They worked together quite well. Claudia learned from a science magazine that a new kind of rubbish bin which can s    9     time, money and energy. Then Alex practiced his presentation over and over again. A week later, it was time to present! After the meeting, Claudia told Alex with e    10     that Go Green agreed to buy new rubbish bins for the park! Alex and Claudia have never been so proud of themselves.