A. 根据汉语提示，首字母或英文解释填写适当的单词，使句意完整：
1. Our teacher often tells us something about ____________ (the state of not being able to see).
2. We teach them new skills and k_____________.（知识）
3. It is an ______________(very good)chance for me to improve my English.
4. Computer is one of the most useful _____________(发明).
5. This illness can be _______________(治愈)easily
B. 用所给词的适当形式填空：
6. Don’t worry, there’s some time ___________(leave).
7. The stamps are used _________________(send) letters.
8. Many people like playing computer games, __________(most) young people.
9. Dr, Ma did two or three ___________(operate) in the hospital in the past.
10. I hope he _____________(tell) me about the plan next week.
11. We can help UNICEF by doing some ____________(volunteer) work.
12. We should be ____________(grate) to our teachers for their help.
13. _________(support) charities is meaning.
14. It is important for me __________(take) the chance.
15. The walk ___________(it)  is not easy.