31.bath towel - insulator

32. wooden ruler - insulator

33. notebook - insulator

34. spoon - depends on whether it's a wooden spoon or metal spoon

35. paper clip - conductor

36. rubber gloves - insulator

37. pencil - insulator

38. ring - conductor

39. cold water - insulator

40. copper wire - conductor

Answer:

31.Insulator

32.Insulator

33.Insulator

34.Conductor

35.Conductor

36.Insulator

37.Insulator

38.Conductor

39.Insulator

40.Conductor