The birds
leave the town if we don’t build up nesting boxes. (HAVE TO)

Ken
clean out the pond. (NOT HAVE TO)

We
collect the rubbish during the rain yesterday. (HAVE TO)

1. c) to stay

2. a) to have

3. b) stay 

4. c) listening

5. b) is

6. b) for

7. c) no, a) some

8. c) was

9. b) since

10. c) did

11. a) she said she was having breakfast.

12. a) the

13. c) will/-

14. a) the/the

15. b) in

16. a) wants

17. b) off

18. d) in

19. d) shorter

20. b) was already started

21. c) to wake him up

illegal

rewrite

subtitles

  ex+wife=ex-wife

  uncomfortable

  turtles - лишнее слово