Here’s a possible completion of the text using the words provided:

Some farmers told the local newspaper that they were (11) **terrified** by what they saw. They were working on the farm when they saw a(n) (12) **huge** object flying across their farmland. They believed that it was a(n) (13) **UFO**. Some of them even said they also saw (14) **aliens**. After that, the disk-shaped flying object (15) **disappeared** in the dark sky.