根据句意及首字母提示完成句子。

1. To our s_________, he arrived here earlier this time.

2. I have made a d_________ to learn English next week.

3. It was e__________8'clock when I got home.

4. Do you think it's a w________ of time to spend much time chatting on the Internet?

5. His careless driving _______the traffic accident.