1.are - reach

2.comes

3.came - had left

4.has never flown

5.have just decided -would undertake

6.would take

7.was

8.am attending - was attending

9.arrive - will be waiting

10.had lived

11.Got - had already arrived

12.will see - see - will have graduated

13.visited - was

14.has been - haven't you read

15.is washing - has just repaired

16.Have you been - spent

17.have never met - looks

18.will have been- comes

19.found - had just left

20.arrive - will probably be raining

1. In all the world, there are only 14 mountains that reach above 8,000 meters.

2. He sometimes comes to see his parents.

3. When I came, she had left for Dalat ten minutes ago.

4. My grandfather has never flown in an airplane, and he has no intention of ever doing so.

5. We have just decided that we will undertake the job.

6. He told me that he would take a trip to California the following week.

7. I knew that this road was too narrow.

8. Right now I am attending class. Yesterday at this time I was attending class.

9. The traffic was very heavy. By the time I got to Mary’s party, everyone had already arrived.

10. I had visited my uncle’s home many times when I was a child.

11. That book has lied on the table for week. Haven't you read it yet ?

12. David is washing his hands. He has just repaired the TV set.

13. Have you been here before? Yes, I spent my holidays here last year.

14. We have never met him. We don’t know what he looks like.

15. The car will be ready for him by the time he comes tomorrow.

16. On arriving at home I found that she had just left a few minutes before.

17. Last night we was watching TV when the power failed.

18. London has changed a lot since we first came to live here.

19. While we were talking on the phone the children started fighting and broke a window

20. I have spent a lot of time travelling since I got this new job.