Write the correct form of the given words.

17. It is possible that we find ______________ things on another planet. (LIVE)

18. I find her story about UFOs hardly ______________. (BELIEVE)

19. Environmental pollution has led to the ______________ of many species of plants and animals from our planet. (APPEAR)

20. Many UFO ______________ have been recorded by the United States government. (SIGHT)

Choose the best option (A, B, C or D) to complete each of the following questions.

5. The farmer ______________ in the field when he saw a UFO.

    A. is working          B. was working           C. worked                   D. works

6. Scientists float in a space station because there’s no ______________.

    A. technology         B. science                    C. gravity                    D. air

7. The world’s ______________ is growing more quickly every year. Our planet is becoming more and more crowded.

    A. pollution             B. popularity               C. population              D. pollutant

8. A: What is the word that means 'very small'?

B: I think it's '______________'.

    A. huge                   B. strange                    C. tiny                         D. scary

9. The magician was standing on the stage, but then he suddenly ______________.

    A. saw                     B. heard                      C. appeared                 D. disappeared

10. The UFO hovered ______________ our house for a few minutes then disappeared into the clouds.

    A. above                  B. under                      C. inside                      D. on

11. Those aliens looked really scary. I was ______________ when I saw them!

    A. delighted             B. terrified                  C. happy                      D. bored

12. I think she is sick. She ______________ to school tomorrow.

    A. will go                B. won't go                  C. is going                   D. doesn't go

: Read the passage and choose the best answer for each gap. (1,2m)

Mars is called the Red Planet because of its reddish (21)…………….. There have been many explorations to Mars by humans since the mid-20th century. Scientists hope that we can find another planet to (22)…………………… human life.

              There are major reasons why the (23)……….. on Mars is unsuitable for human life. Temperatures on Mars can be as low as -87 degrees Celsius and rarely get above 0 degrees Celsius. But the bigger problem is the lack of oxygen. 95% of the atmosphere is carbon dioxide (CO2), and this is (24)………….. to breathe. Moreover, there is no water on Mars even though scientists have found traces of it. Reason why we are be able to live on Mars.  (25)…………; as early as the mid-19th century, (26) ………… discovered that Mars had some similarities to Earth. A day on Mars is 24 hours, 39 minutes and 35 seconds, almost the same as a day on Earth. Mars also experiences seasons just as Earth does. However, the seasons are twice as long because a year on Mars lasts about twice as long as an Earth year.

21.         A. surface                             B. land                       C. ground                 D. body
22.         A. to accommodate                        B. accommodation   C. accommodate      D.accommodations

23.         A water                                 B. climate                   C. oxygen                  D. food

24.         A. poison                               B. poisoning              C. to poison               D. poisonous

25.         A. However                         B. Because                 C. Although             D. So

26. A. doctors                                     B. scientists              C. engineers           D. professors