阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Bao Bao, 【小题1】 (bear)at the National Zoo in Washington, started settling into her new home Thursday in southwest China. Under a(n) 【小题2】 (agree) between China and the US, such baby pandas must be returned to China before they are 4 years old, the earliest age when they might begin to produce young.

The 3-year-old landed in Chengdu in Sichuan Province on Wednesday after a 16-hour flight, during which she【小题3】 (look) after by a professional panda keeper Marty Dearie from the National Zoo.

Bao Bao, whose name【小题4】(mean) “treasure”，will first go through a month-long quarantine (隔离期) at the Dujiangyan base,【小题5】 keepers will monitor her diet, activities and health during that time.

A 100-square meter area of land has been prepared 【小题6】 her at the base, including both indoor 【小题7】 outdoor play areas, equipped with rubber balls and a tire swing for entertainment and fresh bamboo and apples for eating. Keepers will work hard 【小题8】 (help) BaoBao get used to local bamboo and other Chinese foods.

Having been considered as one of the world’s most endangered 【小题9】 (animal), giant pandas live 【小题10】  (main)in the mountains of Sichuan, with some also found in neighboring Gansu and Shaanxi Province.

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线，并在该词下面写出修改后的词。
注意:1.每处错误及其修改均仅限一词；
2.只允许修改10处，多者(从第11起)不计分。
Last Sunday our school organized a mountain-climbing activity, which purpose was to inspire us students to take more outdoor exercise. Hundreds of students take part in it. Having gathering at the Xiangshan Park at 8:00, they set out for the top in high spirits. Along the way we enjoyed the beautiful scenery, chatting with each other happy. If someone fell behind, others would come and lend them hand, such as carrying their bags or giving them encouraged words. After about two and a half hour, we all reached the top, where we jumped and cheered with joy.
The activity benefited from us a lot. Not only did we get some exercise, and also we promoted our friendship.