1. Mark Zuckerberg, Facebook's chief, is testing a software that will put children in _______ of their own learning, recasting their teachers as facilitators and mentors.
(A) responsible
(B) place
(C) charge
(D) lead

50. When you are in a safari vacation, the rule of thumb is to pack light. Your luggage may be limited to a small duffel bag, so try to limit your clothes to whatever is necessary. For example, bring enough clothes for two days only.______Then, you can dry the clothes in the sun.Which of the followings is the most appropriate supporting sentence (to be put in the blank)?(A) Safari camps generally provide laundry service for you to wash the clothes by hand.(B) You should avoid wearing white clothes because it attracts animals' attention easily.(C) Black and other dark colors are recommended because they are less obvious when they get dirty.(D) The best way is to dress in layers as the areas can be chilly in the mornings and late afternoons.

3. Answer A, B or C: If y = f(u) and u = g(x), where f and g are twice differentiable such that g'(x) = g(x), then equals...(A)(B)(C)

4. Answer A, B, C or D: If x is measured in meters, r(x) is a function of x and r is also measured in meters, and ρ is measured in kg.m, then what is the unit of (A) kg.m-1 (B) kg.m (C) kg (D) kg.m²

5.Answer A, B, C or D: Which of the following expressions is WRONG? If you think they are all correct, answer D.(A)= f(g(b)) - f(g(a))(B)= f(g(b)) - f(g(a))(C)= f(g(b)) - f(g(a))(D) None of the above.

2. In just a few years, technology giants have begun remaking the very nature of schooling on a vast scale, _______secondary schools nationwide.(A) impacting(B) ranging(C) limiting(D) impressing

3. Some tech teachers believe that applying an engineering mindset can improve about any system, and that these tech giants' business insights _______ them to rethink the country's education.(A) embrace(B) enable(C) enrich(D) enhance

4. Given the changes in innovations with artificial intelligence and automation, some tech leaders are experimenting different models to find out which can _______ better results.(A) establish(B) apply(C) cause(D) yield

5. About a decade ago, when Amazon introduced its first e-reader, publishers_______ that digital books would take over the industry, the way digital transformed the music industry. And for a while, that fear seemed totally justified.(A) captured(B) concerned(C) panicked(D) prohibited

6. Social media has had an_______ impact on publishing, as it has on all corners of the media industry. It has definitely become a new way for readers to connect with authors and discover books.(A) sustainable(B) enormous(C) radical(D) ingenious

7. Some investors, however, see plenty of_______in the center of the U.S. In fact, focusing on the Midwest is no longer considered a crazy idea.(A) potential(B) challenge(C) mission(D) vision