Question 1. Pronunciation
Question 2. main stress
Question 3. Pronunciation
Question 4. main stress
Question 5. Astronauts from different countries are working at the International Space ______________.
Question 6. The UFO hovered ______________ our house for a few minutes then disappeared into the clouds.
Question 7. Don't worry. I promise I will ______________ it tomorrow.
Question 8. What ______________ people doing when the UFO appeared?
Question 9. Mercury is very close to the Sun, so the daytime ______________ can reach over 400 degrees Celsius.
Question 10. The boys were ______________ when they saw a flying saucer land in their backyard.
Question 11. In a hundred years, people ______________ in space stations as there ______________ enough space for us on Earth.
Question 12. The farmer ______________ in the field when he saw a UFO.
Question 13. Jane’s mom: In 2100, there will be many space stations near Earth. Jane: ______________
Question 14. Scientists have spent years ______________ information about UFOs.
Question 15. The gravity on the moon is different of that on Earth.
Question 16. In my dream, I talked to an alien from another planet by a very strange language.
21. The children were playing noisily in the backyard. The doorbell rang.
→ WHILE(17)
Colin saw a strange disk-shaped flying object on his way home.
→ WHEN_(18)