Complete these sentences by adding "could", "be able to" or "could have" into the appropriate blank:
1. She ______________________ sing during day.
2. Someone ____________________ love the song.
3. He ___________________ done those tasks well.
4. The roof _________________ be down.
5. Bitterflies __________________ flied if we haven't killed them.
6. I would ___________________ marry with Maria if I spoke out my love.
7. The little girl _________________ hear someone's step sound over distance.
8. When I was child, I _______________ sit to read books during 8 hours without stopping.
9. Paul haven't ____________________ pass the graduate examination.
10. Every day I hate the bitter taste but yesterday, I _____________________ finish up a bitter soup pot of my mom.
11. If they haven't discouraged, maybe I __________________ be a star.
12. Lala ____________________ taste every interests.
13. I __________________ raise the ball 2 days ago.
14. My father ___________________ been an excellent volleyball player if a hurt on his arm had not recured.
15. Jimmy ____________________ climb tree quickly, but now he isn't.
16. You ___________________ win the singing contest if you had a good voice.
17. I'm very ignorant but on Thursday last week, I ___________________ overcome Stephen, who is the best student in my class.
18. If I had wanted, I __________________ gone up for an examination of grade A.
19. One day, noone will ______________________ see her on this land.