When I was 25 years old, I had a big dream in my mind and lots of things in my backpack. I wanted to travel around Africa with my _______. So I left my hometown with great confidence and _______ in Cape Town on a one-way ticket, not really sure what to do next.

_______, before my trip actually started, I met a kind, old Nigerian man. He gave me the best travel _______ I ever received: “Be like a student on your way around the world.”

It sounds _______, but it really changed my mind about travelling. He helped me _______ that travel is about learning and observing different _______. “It’s far too easy to go into a new country for you and believe your ways are better. But if you study, ask questions, and try to learn from the locals, you’ll have far richer _______, ” he promised me.

On other trips _______ I was on my tour way to Cancun, I didn’t know the man so I was just a ________. I only stayed there for a week to see the sights and places of interest and then left. The culture didn’t ________ me. I left the cities and towns without really knowing anyone or anything. Those people and things ________ in those very places to which I had ________ a visit.

This time, I promised myself that I would be a ________ student traveller. After seven months of ________ travelling from Cape Town to Cairo, I returned home. Having a student-like attitude helped me learn a lot. This trip satisfied me more than any other trip ever did to me.

Brad Ryan had been feeling burnt out from veterinary (兽医的) school when he visited his 85-year-old grandma back in 2015. He hoped that spending some _________ family time in his hometown would help to lift his spirits.

As he was telling his grandma some _________ of his travels, he was _________ to hear her confess (承认) that she had never seen the sea or mountains. Ryan then asked his grandmother if she would like to _________ the Smoky Mountains with him. Needless to say, she was more than _________ to go with him. Then Ryan made a plan and they set out on their _________.

They have since visited 29 different national parks across America-from the breathtaking slopes (斜坡) of the Great Sandy Dunes in Colorado to the attractive shores of Acadia National Park in Maine.

Over the _________ of the last three and a half years, Ryan says that he and his grandma have _________ driven 25,000 miles through 38 states, and it has _________ his quality of living.

“Seeing it through my grandmother’s eyes, who every morning wakes up and is __________ to be alive, has taught me how to __________,” Ryan said. “With her, I’ve had to __________ and see my life in a different way, which has made it much __________.”

“I __________ my grandma, and our journeys really gave me a lot of peace before she eventually passed on. I can __________ these places and feel her spirit and feel connected to her, because she set her eyes on the __________ things,” he added.

Ryan, who has been __________ all of their adventures online, hopes that their social media presence will __________ other youngsters to spend more time with their elders.

“I want people who are still __________ to know, it is cool to hang out with your grandparents,” Ryan said. “There’s so much __________ and knowledge we can get from our elders.”

Ecotourism is often regarded as a form of nature-based tourism and has become an important alternative source of tourists. It is broadly defined as low __________ travel to endangered and often undisturbed locations. It is different from traditional tourism because it allows the traveler to become educated about the areas. And it often provides funds for conservation and __________ the economic development of places that are frequently poverty-stricken.

Ecotourism and other forms of sustainable travel have their __________ with the environmental movement of the 1970s. Ecotourism itself did not become prevalent (流行的) as a travel concept until the late 1980s. During that time, increasing environmental awareness and a desire to travel to natural locations as __________ to built up tourist locations made ecotourism desirable.

Since then, several different organizations specializing in ecotourism have developed and many different people have become experts on it. Martha D. Honey, PhD, a co-founder of the Center for Responsible Tourism, __________, is just one of many ecotourism experts.

Opportunities for ecotourism exist in many different locations worldwide and its activities can vary __________.

Madagascar, for instance, is famous for its ecotourist activity as it is a biodiversity hotspot, but also has a high priority for environmental conservation and is devoted to reducing poverty. Conservation International says that 80% of the country's animals and 90% of its plants are __________ to the island. Madagascar's lemurs (马达加斯加狐猴) are just one of many __________ that people visit the island to see.

Because the island's government is __________ to conservation, ecotourism is allowed in small numbers because education and funds from the travel will make it easier in the future. __________, this tourist revenue also aids in reducing the country's poverty.

Despite the popularity of ecotourism in the above-mentioned examples, there are several __________ of ecotourism as well. The first of these is that there is no one definition of the term so it is difficult to know which trips are __________ considered ecotourism.

Critics of ecotourism also cite that increased tourism to __________ areas or ecosystems without proper planning and management can actually harm the ecosystem and its species because the infrastructure needed to sustain tourism such as roads can contribute to environmental degradation (恶化).

Ecotourism is also said by critics to have a negative impact on __________ communities because the arrival of foreign visitors and wealth can shift political and economic conditions and sometimes make the area __________ tourism instead of the domestic economic practices.

Regardless of these criticisms though, ecotourism and tourism, in general, are increasing in popularity all over the globe and tourism plays a large role in many worldwide economies.