tìm lỗi sai ----- Nội dung dịch tự động từ ảnh ----- 1. My sister has taken part in swimming competition at school last week and wins the third prize. 2. The longer book I read is the Prison Diary of Ho Chi Minh. 3. Singapore is cleanest city in the world. 4. It doesn't rain since last week. 5. I have never seen a such big flower. 6. It spent a long time to travel to the skiing resort but in the end we got there. 7. Have she finished her homework yet?