Answer:
A)
1. are
2. is
3. is
4. are
5. are
6. is
7. are
8. is
9. are
10. Is
B)
1. There, It
2. It's, It
3. There
4. There, It
5. There
6. There
7. There, it
8. It
9. There, There
10. There, It
C)
1. There
2. They, They
3. There, It
4. There, They
5. It, There
6. They, There
7. It, It
8. It
9. They
10. There
Let me know if I need to type out the sentences :)) I hope this helps. / Avíseme si necesito escribir las oraciones :)) Espero que esto ayude.