将下列选项中的词语依次填入各句横线处，最恰当的一组是 ①为了纪念世界反法西斯战争胜利60周年，俄罗斯邀请了世界50多个国家和国际组织的       人物参加庆典活动。 ②在改革开放的新形势下，我们仍然要从实际情况出发，从中探索出固有的而不是         的规律。 ③放学时间还没到，集体活动还没结束，你怎么能         离开学校呢

I always feel______ when I talk in front of the class.—You should not worry about it. Just believe you can do it well.

Where on earth have they gone?—I have no idea, but I wish I .

cretary worked late into the night, along speech for the president

You look so tired tonight. It is high time you_________.