填入下面一段文字横线处的语句，最恰当的一句是（ ）有一次，有人曾向希尔伯特请教：明天最重要的技术是什么这位20世纪科学工作者界的领袖幽默地说：“到月球上去抓苍蝇。” 。希尔伯特在回答为什么时说：“因为要实现这一目标，必须解决许多连带性的技术难题，而这意味着要解决人类面临的几乎一切的物质困难。”今天，人类已经成功地登上了月球。去月发电、种庄稼，已经像“抓苍蝇”一样实实在在地摆在我们面前。

__ to go on a diet, but the dishes atthe party were simply impossible to resist.

Our plan to clean the park ________ tomorrow.

Millie is very_______, so we all want to make _______ with her.

The boss said we had only three days tofinish the task—-No problem We have already _________two thirds of it