Complete the following sentences with the present perfect or present perfect continuous.
16. So far the college authorities (try) _________ to make the application progress as simple and fast as possible for international students.
17. The university (establish)_________ an international faculty that is responsible for the
partnership with overseas institutions since 2005.
18. Since 2000, the Ministry of Education and Training (attempt) _________to prevent classroom overcrowding with a plan to establish a further number of over 40 universities in Viet Nam.
19. Scientists (put) _________ a lot of effort into the area of science and technology since the
economic reform in Viet Nam.
20. The international A-levels (be)_________ considered by many experts in the field of education to be the “gold standard” of examinations for a very long time until now.