III. Read the following paragraph and choose the best answer:
Scientists are now looking (17)_____ cheaper way to use solar energy to heat air and water. Many buildings are (18)_____ solar energy to heat their water now. Solar units on the roofs of buildings (19)_____ the energy and use it to heat water. Although these units are still very expensive, more and more people are buying solar hot water heaters. Universities and colleges give solar energy courses (20)_____ students learn to build their own solar collectors. There are also many books that explain the construction of solar collectors. In the future, there will be more and more solar collectors especially in the sunny desert areas of the world.
Câu 17. A. into B. after C. at D. for
Câu 18. A. using B. used C. making D. doing
Câu 19. A. dialect B. neglect C. reflect D. collect
Câu 20. A. where B. whose C. which D. who
B. WRITING ( 5marks)
I .Rewrite the sentences, using the words given. (2 marks)