ch wrote, ”No entry without being invited.”Р13. I think you are necessary to go to Beijing by yourself.Р14. The writer through his own experience to tell us a fact, ”Parents’ love is unconditional.”Р15. Sometimes QQ can instead of telephone to chat with friends.Р答案:1. listen 后加to 2. wait后加 for 3.(本句式是部分否定) 4. When it is convenient for you, 5.Great changes have taken place in our school in the past 20 years. 6. A terrible earth quake happened in Tangshan in 1976. 7.第二个are去掉 8.This book belongs to me. 9. It’s very easy for me to find your house. 10. to 去掉 11.What is the population in China? 12. which read/said Р13.I think it is necessary for you to go to Beijing by yourself. Р14. The writer tells us a fact through his own experience…Р15.instead of 改为 replace/take the place of/substitute