1. travel / travel(l)ing
2. history
3. study
4. teenagers
5. kitchen
6. crime
7. appointment / booking
8. sugar
9. stamps
10. parking
11. D,E
12. D,E
13. A,C
14. A,C
15. C
16. B
17. A
18. stress
19. weight
20. families
21. C
22. E
23. H
24. B
25. A
26. F
27. A
28. C
29. B
30. B
31. insects
32. behaviour / behavior
33. father
34. complex / complicated
35. reproduction / breeding
36. control
37. duck(s)
38. language
39. food
40. cost(s) / price(s) / bill(s)