Viết lại câu mà nghĩa không đổi:
1. He was delighted to receive his aunt's letter. => He was delighted that..........................
2. Old car tires are recycled to make shoes and sandals. => People.......................
3. I'm very sad that I wasn't accepted in that group. => I'm very sad not.......................
4. It's three years since I last spoke to her. => I haven't........................
5. "Please turn down the radio for me", said my father. => My father asked.........................
6. Lan will be fifteen next week. => It is Lan's..................................
7. How long is it since you used the pen? => When......................................?