16. I don’t think it will come true soon; however, your idea is really ............................(IMAGINE)

17. Thomas Edison is one of the greatest ………………….… in history. (INVENT)

18. ………………….…(or the state of having no home) is a significant social issue worldwide. (HOME)

19. Life in the city is more ………………….…than that in the countryside. (STRESS)

20. We couldn’t see the airplane because it ………………….…behind the cloud. (APPEAR)

V. Use the words given and other words to complete the second sentence

21. We shall be using wind power at this time next year. (used)

Wind power …………………………….at this time next year.

22. I will be with my brother in Son La Hydro Power Plant at this time next week. (staying)

At this time next week ……………………………..my brother in Son La Hydro Power Plant.

23. Solar panels will be put in the back yard next Saturday. (put)

They ………………………………………in the back yard next Saturday.