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 because no one will say the truth.

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

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

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

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