Choose the correct variant to fill in the gaps.

There ... a lot of different nationalities in the world many years ago. One of them were the Vikings. They ... in Scandinavia and ... as traders. They ... also great sailors and ... travel to different places of the world on their ships. They ... their ships to sail fast. Scientists are sure that the Vikings ... to England in the 8th century and even ... Greenland in 981 AD. They ... games, music and sports and ... very strong men.