根据对话内容，从下面方框中选择适当的单词或短语填空，使对话完整正确。
laughed at think twice about lost heart certainly in all
A: How is everything, Jim?
B: Well, not so good. I am feeling like giving up my project.
A: Why? You seem to have 1 . What happened?
B: I made some mistakes. And it seems impossible for me to complete the project.
A: You'd better 2 it. Anyway, you have spent two months on this project 3 .
B: That's true. But the more I work, the harder it becomes. What if I fail in the end? I am in fear of being
4 by others.
A: How do you know you will fail? You will 5 fail if you stop trying now. Don't be afraid of
mistakes. Whenever a mistake is made and you try to find ways to avoid similar mistakes, you will be
closer to success. Believe in yourself, you'll win!
1. lost heart 2. think twice about 3. in all 4. laughed at 5. certainly