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.

（2003年）《多边投资担保机构公约》承保的“违约险”中的“约”是指下列选项中的哪一种？

A．东道国公司与外国投资者签订的契约

B．东道国公司与外国投资者所属国政府签订的契约

C．东道国政府与外国投资者签订的契约

D．东道国政府与多边投资担保机构签订的契约