__________he presented her at the dance party was an engagement ring

你叫李平，是英语系学生会主席。写一封信给王教授，请他做一个有关中国历史的报告。注意信中要包括目的、时间、日期和地点。

As to his experience, he is not very suitable for this position.

It is human being’s duty to protect the natural environment from being polluted.

If the weather permits, we are going to set out tomorrow morning.

我刚从大学毕业，正在找一份有兴趣的、报酬高的工作。

We hope you can accept our invitation and look forward to meeting you in Beijing.

论实际用途，没有那个计算机网络能比得上国际互联网。

他赞成采取严格的措施来控制污染。

如果有足够的人力和资助，我们的目标一定能实现。

What did the writer’s mother dislike about Sunday afternoons?