13. A

14. C

15. B

16. B

17. D

18. C

19. C

20. B

----

1. enjoying 

2. are you doing- am watching

3. have been

4. is being built

5. will be

6. returns 

7. listening 

8. to learn

9. am having

---

1. portable 

2. excited

3. painting

4. mainly

5. unhealthy

6. careless 

7. unhappy

8. employees

9. better

10. furnished 

---

1. B -> X

13.A together

14.C collector

15.D hard

16.B traffic

17.D showing

18.C anyway

19.C that

20.B i'd love to

1.going

2.are you doing/am watching

3.were

4.is being built

5.will you be

6.returns

7.listening

8.to learn

9.am having

1.portable

2.excited

3.painful

4.maintain

5.unhealthy

6.careless

7.unhappy

8.employees

9.better

10.furnished