----- Nội dung ảnh ----- 8. The New York Public Library main branch is __________ 42nd Street __________ Manhattan. a. in - on b. in - in c. at - in d. on - in 9. I must be present at school __________ seven o'clock __________ the morning. a. at - on b. at - in c. on - in d. at - on 10. The teacher wrote the sums __________ the board, and the children copied them down to __________ their exercise books. a. on - on b. at - in c. on - in d. at - on
