1. Tìm lỗi sai trong câu và sửa lại cho đúng
1.1. I have stomach ache, or I don't want to eat anything.
1.2. The Americans often eat fast food, but many of them are overweight.
1.3. I use to walk to work when I was younger.
1.4. He use to have long hair but nowadays this hair is very short.
1.5. We were all horrifying when we heard about the disaster.