9. After a few decades of the economic reforms, Vietnam has increased the living _______ of people.
A. surfaces B. standards C. levels D. backgrounds
10. In five more minutes, they_______for three hours on the phone.
A. are talking B. have talked C. will have been talking D. will talk
11. Nam: What do you think about his story? - Tan: ____________, it’s not true.
A. In my opinion B. I know
C. According to me D. I don’t think