Here’s the completed article with the past simple form of the verbs:

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**GRAHAM’S BIG ADVENTURE**

Between 2009 and 2012, Graham Hughes **visited** all the countries in the world. At that time, there **were** 201 countries. There are now only 195. Graham **did** this without taking a flight. He **travelled** by boat, bus and train, by taxi and on foot, and he **spent** $100 a week on his journey. He **started** his amazing journey on New Year’s Day 2009. It was sometimes very difficult. He often **waited** for weeks for a boat. But Graham **did not stop**, and on Monday 26th November 2012, the 1,426th day of his journey, he **arrived** in the last country: South Sudan. Graham is the only person to see every country in the world without taking a flight.

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