Câu 13 đâu bạn? Mình thấy có phần cuối mà không thấy phần đầu thì sao làm đc?
Câu 15: He walked along the road, wondering what ___had happened__ (happen) and where all the people _had gone_ (go). The streets _were_ (be) deserted, and the stalls _were left_ (be leave) as they _were_ (be) with fruit and vegetables arranged in neat rows.