Here are the completed sentences:

1. I **am** a member of the IT club.
2. I **use** an iPad to listen to music.
3. We **will live** much longer in the future.
4. My younger sister **is having** lunch with her friends now.
5. Listen! Someone **is whispering** in the next room.
6. The report isn't right! They **made** a mistake.
7. Someone **took** my car.
8. I **was** at my aunt's house yesterday afternoon.
9. When I was 5 years old, I **broke** my arm.
10. Lisa **swam** in the sea when the rain started.
11. When I arrived, Kathy **had gone** away.
12. I think I **heard** a strange sound outside the house 5 minutes ago.
13. She **exercises** every morning.
14. They are **looking for** a woman about the way to the railway station.
15. Look at the black clouds! **It’s raining.**

Let me know if you need anything else!