---I’m afraid I don’t have the ability to make a speech in public. I’m too nervous. ---Don’t worry. You will overcome it _______if you practice more.
23. If you want to do the experiment again, you had better be more careful________ you made a mistake.
22. All of us want very much to see these recommended movies, especially _____ you referred to just now.
21. Perseverance is a kind of quality, and that’s ______ it takes to do anything well.
20. —Why was __ you lost all your keys? —It was because of my carelessness.
19. To work at home has been made _____ with the development of the Internet.