I. Viết lại câu sao cho nghĩa không đổi: 1. The last time we saw her was on Christmas day. We haven't ............................................................................................. 2. I haven't eaten this kind of food before. This is ............................................................................................. 3. It started raining an hour ago. It has ............................................................................................. 4. We haven't visited my grandfather for two months. The last time ............................................................................................. 5. I have studied English for three years. I began ............................................................................................. 6. My brother hasn't seen his best friend for nearly five years. It's ............................................................................................. 7. When did you start learning English? How long ............................................................................................. 8. We started living here fifteen years ago. We have ............................................................................................. 9. The last time she visited me was five years ago. She hasn't ............................................................................................. 10. I last wrote to my uncle in July. I haven't .............................................................................................