3. The whales' bones are not strong enough holding up their muscles on land. 　　　　 　　　　　　　　

2. The boy seating on a bench at the end of the classroom is my brother.　　 　　　　　　　　　 　　　　　　

1. In the old days the working people were made work long hours.　　　　 　　　　　　　　 　　　　　　　　

19. A great number of large buildings have set up in our country

　　 since liberation.　　　　　　　　　　　　　　　　　　　　　　　 　　　 　　　　　　

　20, The price has been gone up recently.　　　　　　　　　　　　　　　 　　　　　　　　　　　　 　　　

　Keys　1. to be learnt→to learn 2. was happened→happened3. was disappeared→disappeared 4. have been taken place→have taken place　5. is consisted of→consists of　　　　　　　　 6, founded→was founded　7. was broken→broke 8. didn't discourage→were not discouraged　9. must solve→must be solved 　10. have widely used→have widely been used　11. being repaired→repairing　 12. have invited→had been invited　13. being spread→spreading　 14. has raised---has been raised　15. is set→sets 16. were received→have been received　17. has been looked for→is being looked for 18. laughed→laughed at　19. have set up→have been set up　 20. has been gone up→has gone up　

非谓语动词1

18. Tom is often laughed by his classmates.　　　　　　　　　　　　　　 　　　　　　　

17. The little girl has been looked for by her parents.　　　　　　　　 　　　　　　　　　 　　　　

16. No letters were received from their son since last month.　　　　　　　 　　　　 　　　　　　

15. Be quick, we must get there before the sun is set.　　　　　　　　　　 　　　　　　　

14. The living standard of people has raised in the last few years.　　　　　 　　　　　　　 　　　　

13. We have to take measures to prevent the disease from being spread.