Tìm và sửa lỗi sai của các câu dưới đây: 21.Yuri Gagarin was the first man flying into space. 22.There are also many single mothers and single fathers which are raising children by themselves. 23.The man was injured in the accident was taken to the hospital. 24.You have to study hard to keep pace in your classmates. 25.Instead of calling off the meeting, maybe we can just put it over until next month. 26.If you need to keep fit, then why not take on a sport such as badminton or tennis? 27.People respected him because he was a honest man. 28.We had the dinner in a restaurant last night.