6.Vietnamese people’s quality of life has been ……… improved year by year A. significantly B. significant C. signify D. significance 7. The traffic system in our city …………… in the last decade A. had gradually been upgraded B. has gradually upgraded C. has gradual been upgraded D. has gradually been upgraded 8. Many foreigners were astonished that Ha Noi city was quite ………….. what they saw five years ago A. different on B. different from C. different of D. different about 9. There……………...….. many recent breakthroughs in technology. Now consumers can purchase the latest high tech toys. This was not possible even a few years ago A. are B. had been C. have been D. has been 10. Many cities cannot easily create more parks because most land is already ………….. for buildings, roads, parking lots, and other essential parts of the urban environment A. being used B. used C. using D. getting used