LAN IS RIDING HER BIKE TO SCHOOL, _____ ONE OF THE TIRES IS FLAT S...

11. - DE KIEM TRA SO 2 HK II MOICO DAP AN
DE KIEM TRA SO 2 HK II MOICO DAP AN

11. Lan is riding her bike to school, _____ one of the tires is flat so she walks to school.

A. fortunate B. unfortunately C. fortunately D. unfortunate