1. They have studied English for three years now. -> They started ……………………………………………………….. -> It’s ………………………………………………………………… ->They began ………………………………………………………. 2. Tim has been collecting stamps since the first of May. -> Tim began………………………………………………………….. ->It’s ………………………………………………………………….. 3. My grandpa has worked in the music intrustry since he was a college student. ->He …………………………………………………………………… 4. They started working for this company seven months ago. ->They have ……………………………………………………………… -> It’s ……………………………………………………………………… 6. Tom and Mary have worked in that factory since 1990. -> Tom and Mary ………………………………………………………….. 7. It started raining an hour ago. -> It has……………………………………………………………………… -> It is ……………………………………………………………………….. 8. We moved to london in 2003. -> They have …………………………………………………………………. 9. I have had the motorbike for five years. -> I bought ……………………………………………………………………. 10. I have studied English for three years. ->I began …………………………………………………………………………

Nêu những nét chính về tình hình kinh tế, chính trị, đối ngoại của Trung Quốc từ 1991 đến nay