Shool education is very 　i　　 1　 　and　 u　 2　　 　. No one can learn everything at shool and a teacher cannt teach his students everything. His work is to show his students　 h　 3　　 to learn. He teaches them how to read and how to think. So much more is to be learned outside school by the students themselves.

　　　　 It is always more　 n　 4　　 to know how to study　 b　 5　 oneself. It is quite　 e　 6　 　to learn something, but it is　 d　 7 　to use it to solve problems. Great inventors do not get everything from shool, but they can make manythings and c　　 8　 　the world a lot.

8. Water is a 　　　　　　(colourless, colourful) liquid(液体)。

7. I'm afraid the news isn't very　　　　　 (cheerful, cheerless).

6. She is a nice lady. It's　 　　　(hopeful, hopeless) trying to convince(说服)her.

5. It is　 　　　　　(meaningless, meaningful) to chat(聊天)on the line beacuse no one will say the truch.

4. He comes in with　　　　　 　(noisy, noiseless) footsteps(脚步)to surprise her.

3. Somking is　 　　　　　　(harmful, harmless) to your health.

2. Videos are 　　　　　　(useless, useful) to have in the classrooom.

1. Be　 　　　　　　(careful, careless) crossing the road.

10. It's very 　　　　　　beacuse of the busy traffic.