Choose the correct answer to fill in each of the blanks in the passage.
My name's Peter. My school is Greenfield Bilingual School. Students at my school learn some (17) __________ in two languages. For example, we learn Maths and Science in both Vietnamese and English. It's a bit difficult, (18) __________ the lessons are always interesting. The school is only 500 metres from my house, so I go to school (19) __________ foot every day. The students (20) __________ Greenfield Bilingual School wear uniforms on Mondays and Fridays. Besides studying, we also play sports and join many clubs. (21) __________ a week, my best friend and I go to a chess club. We have a lot of fun there.