Pag. 72 es. 13

1. haven't seen
2. in
3. have you been
4. had been
5. for
6. did you do
7. had been working
8. did you arrive
9. arrived
10. have been
11. since
12. haven't met

es. 14

1. will you go
2. am going to stay
3. will you go
4. am going
5. will go
6. will drive
7. will you stay
8. are couchsurfing
9. will have
10. will find

es. 15

1. used to work
2. am working
3. was going
4. met
5. was working
6. was wearing
7. haven't seen
8. have you been
9. was
10. saw
11. were looking
12. took
13. have you been working
14. have been working
15. have you visited
16. have been
17. have just come
18. did you go
19. went
20. have been
21. visited
22. are you going
23. feel
24. am leaving
25. am looking
26. will be
27. reached
28. was feeling
29. went
30. wrote
31. will be

es. 16

1. B
2. A
3. D
4. B
5. B
6. A
7. C
8. D
9. A
10. C
11. B
12. D
13. A
14. A
15. C
16. D
17. D
18. B
19. B
20. C