Đề bài: Circle the mistake and then correct it. ----- Nội dung dịch tự động từ ảnh ----- 4. Helen has finished her lunch and she went out to play. A 5. They haven't seen each other since September when they have met at Mary's party A 6. Peter has bought a new MP3 player yesterday but I haven't seen it yet. A B 7. The hockey player hit his head on Friday and he was in hospital since then. B
