mn oi giup mik gấp voi ạ

7. I had known what to do in such situation

8. opened for a week

9. so big that we have got lost in it

10. Unless we have a key, we can get into the house

11. written to each other for 8 years

12. to have been very talented when he was young

13. too far from the train station

14. believed to have been invented by the Chinese in 105 A.D

15. putting our luggage under the seat

16. If I had time, I would have surfed the Internet more

17. seen my sister since I was in New York

7. I wish I knew what to do in such situation.

8. The new shopping centre has been opened for a week.

9. The university campus is so big that we got lost in it.

10. Unless we have a key, we can't get into the house.

11. We have been writing to each other for 8 years.

12. He is believed to have been very talented when he was young.

13. My house is not far from the train station.

14. Paper is believed to have been invented by the Chinese in 105 A.D.

15. He suggested putting my luggage under the seat.

16. If I had more time, I would surf the Internet more.

17. I haven't seen my sister since I was in New York.

Học tốt!