Use the given words or phrases to make a complete sentence

Use the given words or phrases to make a complete sentence.
37. Astronaut Neil Armstrong / step down onto/ moon / July 20th, 1969 /.
→ ___________
38. there / intelligent beings / other planets / our solar system?
→ ___________
Put the words in the correct order to make a correct sentence.
39. Keywords: has records of/sightings/government/./thousands of/The United States/UFO
→ .......................................
40. Keywords: miles from Earth/the red planet,/140 million/./is about/Mars, which/is known as
→ .......................................