题目内容：

    Can you think of ways to make the world greener? Here is an e1.. A couple have travelled around the world in 297 days---w2. taking any planes. Tom Fewins and Lara Lockwood used 78 buses, 61 trains, 34 cars, 18 boats, six bicycles, and e3. one elephant. They wanted to prove（证明）that tourists can still travel well without damaging（破坏）the e4.. They aimed to produce l5. than 3,000 kg of carbon dioxide（二氧化碳）, compared with six times that amount if they had gone by plane.

They spent ten months travelling 44,609 miles t6. 18 countries on land and sea. The couple’s world tour b7. in June 2008 with a two-hour bus trip to London from their home in Oxforshire. They took the train to Brussels and then c8. a bus and train to Hamburg before going to Copenhagen. The couple even r9.on an elephant for 15 miles through the Chinese part of the Mekong River（湄公河）.

The couple hoped to write a book about their j10.. They thought it could teach other travelers how to travel in a greener way.