语法填空：大象回家了！云南北移亚洲象群平安回归栖息地

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。
China's now-famous herd(群) of wandering elephants is approaching their ___1___(origin) habitat in the southwestern province of Yunnan after traveling southward for days.
The elephants have spent the last five days  ___2___(wander) and foraging(觅食)  in Yuanjiang County of Yuxi City in Yunnan. Drones(无人机) have been used to track the herd's movements in the region.
On Thursday afternoon, the elephants left a field ___3___ they were foraging and headed into the forest. A monitoring team, using both drones ___4___ ground search methods, located the elephants within two hours.
The herd's return journey is expected to be hastened(加快) by lower temperatures in autumn, according to experts.
Since leaving their forest home in southern Yunnan's Xishuangbanna Dai Autonomous Prefecture last year, the elephants ___5___ (travel) northward about 500 kilometers and arrived at the suburbs of the provincial capital Kunming on June 2.
Chinese ___6___ (authority) have sent police to escort(护送) the herd, clear roads ___7___(facilitate ) their passage, and used food to distract them from entering densely populated areas during their journey.
Asian elephants are ___8___(primary) found in Yunnan and are ___9___ first-class state protection in China. Thanks to ___10___ (enhance) protection efforts, the wild elephant population in the province has grown to about 300, up from 193 in the 1980s.
 
8日20时许，云南北移亚洲象群14只大象已跨越元江，平安回归栖息地。

答案解析

1.original 考查词类转换。original habitat 原来的栖息地。original [əˈrɪdʒənl] adj.最初的，原来的。形容词修饰名词。
2.wandering 考查非谓语。spend time doing 花时间做……。
3.where考查定语从句。因先行词为field，指地点，且所填词不在从句中作主语或宾语，故用where引导定语从句。
4.and 考查连词。both...and...。并列关系，用and连接。
5.have travel(l)ed 考查时态。由since(自从)可知，travel动作从过去发生持续到现在，符合现在完成时用法，故填have traveled。
6.authorities 考查名词复数。由谓语部分的have可知主语是复数名词。
7.to facilitate考查非谓语。清理道路的目的是为了便于象群通过，用动词不定式表示目的。
8.primarily 考查词类转换。primarily [praɪˈmerəli] adv. 主要地。修饰动词found，用副词作状语。
9.under 考查介词。under protection在保护下，受到保护。句意：亚洲象主要在云南发现，在中国受到国家一级保护。
10.enhanced考查非谓语。 enhanced protection efforts 加强的保护工作。因保护工作是“被加强”的，用过去分词作定语，表被动。