Fill in: marvellous, clearing, trunks, swamps, thuds, track.

Hi George,
Greetings from Kenya! I'm here on a safari holiday with my school. It's wonderful!
Yesterday we went for a long walk in a local forest. It was very dangerous as there were ... very near the ... we were walking on. After a few hours, we reached a ... .
All of a sudden, we heard some monstrous ... .
We were all terrified. It was nothing to worry about, however, as it was only a herd of elephants. They were a ...
sight and their ... were huge. I'll never forget them. I'll show you some photos when I get home.
Best wishes,
Ben