38. I use a cassette to practice listening skills. →A cassette
39. I’m very keen on joining the rock concert next Sunday.
→I’m looking

42. Henry’s success is his parents’ pride.
Henry’s parents are

38. A cassette is useful for practicing listening skills.

39. I'm looking forward to joining the rock concert next Sunday.

42. Henry's parents are prideful because of his successes.

Explanation:

These are kind of weird sentences and I'm unsure of the objective of the assignment, hope this helps though!

ieoiw what en the: enswer is b

you didn't finish the sentence , how am i gonna you if you didn't finish the sentence