Higher education is very importance (A) to national economies (B), and it is also a source of trained and educated (C) ?

importance (A)-> important
Importance (n): tầm quan trọng, sự quan trọng
Important (adj): quan trọng
S + to be + (adv) +adj
Nền giáo dục cao hơn thì rất quan trọng đối với nền kinh tế quố gia, và nó cũng là nguồn nhân lực được đào tạo và giáo dục cho cả quốc gia.

Higher education is very importance (A) to national economies (B), and it is also a source of trained and educated (C) personnel for the whole country (D).