Fill in the gaps with the correct words.

1 We like to go on cycling holidays and stay at ... campsites.
2 We had to trek up a ... mountain trail for six hours to get there.
3 The highlight of our visit to Peru was the ... ruins of Machu Picchu.
4 My uncle caught a ... virus when he was in Thailand.
5 I'll always remember the ... view from the top of Mont Blanc.
6 For me, Tibet has some of the most ... scenery in the world.