* Check old lesson:
1. Have you heard about UFOs ? Do you think they really exist ?
Why ?
2. What would you do if you saw a UFO ?
3. What happened in 1947 ?
4. How many UFO sightings were there in the world in 1952 ?
5. When did a woman and her children see a UFO above
their house ?
6. What did a farmer see in his farm in 1964 ?
7. What happened with two men in 1971 ?
8. What happened with a young pilot in 1978 ?

* Vocabulary
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I. Speak
Drawing (n): hình vẽ
Mars (n) : sao hỏa

a, Matching
1. Minerals

A: What are these drawings say ?
B: There might be water in Mars .
There may be traces of water in Mars.