Complete the sentences, using the given words. 1. formal school education / VN/ consist/ two levels/education/ primary/ secondary education. 2. children/ start/ Grade 1/age/ 6/and/ finish/ Grade 5/ primary education /age 10. 3. Then/ they/ continue/ the secondary education/ which/ sub-divide/ 2 levels: lower secondary (from grade 6 to grade 9)/ upper secondary(form grade 10 to grade 12). 4. primary/ lower secondary education/ be compulsory/ but/ upper secondary/ higher education/ be optional. 5. children / require/ complete/ 12 years/primary and secondary education/ prior to/ attend/ university/ college.

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