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.

A visually-challenged man from Beijing recently hiked (徒步) 40 days to Xi’an, as a first step ___41___ (journey) the Belt and Road route (路线) by foot.

On the 1,100. Kilometer journey, the man Cao Shengkang, ___42___ lost his eyesight at the age of eight in a car accident, crossed 40 cities and counties in three province. Inspired by the Belt and Road Forum for International Cooperation ___43___ (bold) in Beijing, Cao decided to cover the route by hiking as a tribute (致敬) to the ancient Silk Road.___44___ friend of his, Wu Fan, volunteered to be his companion during the trip.

Cao and Wu also collected garbage along the road, in order to promote environmental ___45___ (protect). Cao believes this will make the hiking trip even more ___46___ (meaning). The two of them collected more than 1,000 plastic bottles along the 40-day journey.

In the last five cars. Cao ___47___ (walk) through 34 countries in six continents, and in 2016, he reached the top of Kilimanjaro, Africa’s ___48___ (high) mountain.

Now, Cao has started the second part of his dream to walk along the Belt and Road route. He flew 4, 700 kilometers ___49___ Xi’an to Kashgar on seat. 20, ___50___ (plan) to hike back to Xi’an in five months.

41. _______

42. _______

43. _______

44. _______

45. _______

46. _______

47. _______

48.  _______   

49.   _______

50. _______