Choose one word from the box to fill in each blank to complete the following sentences.
alien * evidence * existence * meteor * mystery * objects * planet * sampled * trace * trick
1. The cave was full of …………………….
2. When did the world come into ……………………?
3. They had to think of a ……………………to get past the guards.
4. She was seen last week, then vanished without …………………….
5. What would you do if you were an ……………………from outer space?
6. UFOs are strange flying ……………………that are from other planets.
7. A UFO might be an aircraft, a weather balloon or a …………………….
8. Can you give any ……………………for us to believe that there exist UFOs?
9. If I had a chance to travel to another ……………………, I would write a report on it.
10. We ……………………opinion among the workers about changes in working methods.
