exercise 2:
9. do
10. does
11. do
12. do
13. does
14. do
15. does
16. do

exercise 3:
22. lived
23. lived
24. sold
25. when did you see...
26. did
27. met
28. waited
29. studied
30. sold
31. walked
32. taught
33. spent
34. met
35. spoke

exercise 4:
36. - jack didn't go to the shop.
- did jack go to the shop ?
37. - he didn't buy any eggs.
- did he buy any eggs. ?
38. - he didn't take off his hat.
- did he take off his hat ?
39. - joe didn't fall and hurt his arm.
- did joe fall and hurt his arm. ?

exercise 5:
40. were; was
41. did
42. did
43. was
44. did; was
45. did