根据汉语或英文提示，结合句意，填上适当的单词。
1. He likes to go to the (图书馆) to read books when he has free time.
2. I (相信) you will surely be successful. So be confident of yourself.
3. Have you ever been (出国)?
4. To reduce your _____(体重), you should eat less and do more exercise.
5. He is always _____(乐意的) to help people in trouble.
6. I think fights in some action film have a bad _____(影响) on teenagers.
7. My father is one of my _____(偶像). I hope to be a man like him.
8. Tomorrow is my grandma's _____(六十) birthday.
9. _____(lucky), I caught the last train.
10. It's _____(create) of you to design the wonderful poster.
11. At the (begin), I felt it not easy to get on with him.
12. It's (polite) to ask a woman about her age.
13. The Great wall attracts thousands of (visit) every year.
14. He has made his _____(decide) to change his job.
15. I will have my computer _____(repair) tomorrow.
则b的值是( )．