求助一道专八英语改错

求助一道专八英语改错
The Open University was established in 1969 to provide degree coursed (1) ______
by correspondence for students of 21 years and up,(2) ______
regardless of whether they have the entrance qualifications normally needed (3) ______
by the universities .The university now has some 75 thousand students,(4) ______
the majority of which have fulltime jobs.(5) _______
They study at their home about 12-15 hours a week (6) _______
for about 30 weeks of the year.Most their (7) _______
work is with printed self-instructional materials and textbooks,even these (8) _______
are supplemented by some television and radio (broadcast especially by (9) _______
the BBC),and some face-to-face tuition is also available .(10) ______
Certain courses entail a week for summer school.(11)_______
Students may gain a credit for each year’s work,(12) _______
six credits being needed for a degree and eight for (13) _______
an honour degree.Courses are available in arts,(14)________
social science,educational studies,mathematics,science,and technology.(15) _______
Each year,approximately one for every 16 students graduating (16) _______
from the UK institutions is from the Open University.(17) _______
Similar institutions offering high education by distance teaching (18) ________
have been set in several other countries (19) _______
those including Pakistan,Venezuela,and west Germany.(20) ________